Solve cos x + √2 = -cos x for x over the interval [0, 2Π)

Answers

Answer 1

Answer:

[tex]x=\frac{3\pi}{4}\\\\x=\frac{5\pi}{4}[/tex]

Step-by-step explanation:

Trigonometric Equations

It's required to solve:

[tex]\cos x+\sqrt{2}=-\cos x[/tex]

for [tex]x\in [0,2\pi)[/tex]

Adding cos x:

[tex]2\cos x+\sqrt{2}=0[/tex]

Subtracting [tex]\sqrt{2}[/tex]

[tex]2\cos x=-\sqrt{2}[/tex]

Dividing by 2:

[tex]\displaystyle \cos x=-\frac{\sqrt{2}}{2}[/tex]

Solving for x:

[tex]\displaystyle x=\arccos\left(-\frac{\sqrt{2}}{2}\right)[/tex]

We need to find the angles whose cosine is [tex]-\frac{\sqrt{2}}{2}[/tex] over the given interval.

These angles lie on the quadrants III and IV respectively and they are:

x=135°, x=225°

Converting to radians:

135 * π / 180 = 3π/4

225 * π / 180 = 5π/4

The two solutions are:

[tex]\mathbf{x=\frac{3\pi}{4}}[/tex]

[tex]\mathbf{x=\frac{5\pi}{4}}[/tex]

Answer 2

Answer:

The correct answer is option C

Step-by-step explanation:

Solve Cos X + 2 = -cos X For X Over The Interval [0, 2)

Related Questions

17 people over max capacity as an expression is what?

Answers

Answer: x + 17

Step-by-step explanation:

if capacity is x, 17 is added to x, hence x + 17

I’m mental i can do this

Chad has a rope that is 8 yards long. How many pieces of rope measuring 4/7 of a yard can he divide his rope into?
A. 7
B. 28
C. 21
D. 14

Answers

Answer:

B

Step-by-step explanation:

Your answer is 28 because 4/7 turn it to a decimal and then divide 8 from it and that is how you get your answer 28.

Hope this helps:)

Pls mark brainlist

Help pls fast I really need help

Answers

Answer:

104

Step-by-step explanation:

13x4x2

Answer:

104 cubic inches

Step-by-step explanation:

I neeed help pls :p Math

Answers

Answer:

C 4cm

Step-by-step explanation:

times 1.3 by 4 then divide 16 by 4

What is the gravitational PE of the same 61.2 kg person standing on the 6th floor (Each story is 2.5 m high)?

Answers

Answer: U is the change in PE, m is the mass raised through a distance h. So, given m = 61.2 kg, each 1 m rise is an increase of (61.2)(9.8) = 600 J. Likewise, each floor (2.5 m) represents a change in PE of 1500 J for this mass.

Noah's brother sells cars and earns 4.5% commission. He sold a truck for $62,000. How much commission will his brother earn?

Answers

Answer:

the commission earn by his brother is $2,790

Step-by-step explanation:

The computation of the commission earn by his brother is as follows

= Selling price of the truck × commission percentage

= $62,000 × 4.5%

= $2,790

Hence, the commission earn by his brother is $2,790

We simply applied the above formula so that the correct value could come

And, the same is to be considered

Solve for w
-6=2w+6
Simplify your answer as much as possible.

what would be the answer to this question?

Answers

Answer:

w = -6

Step-by-step explanation:

2w + 6 = -6

     -6      -6

2w = -12

÷2      ÷2

w = -6

Answer:

Step-by-step explanation:

w - 6 = 2w + 6

Subtract 6 from both sides

w - 12 = 2w

subtract 1w, or w, from both sides

-12 = w

A customer at a store paid $42 for 4 pairs of pants and 3 shirts At the same store, a second customer paid $2 more for 1 pair of pants and 7 shirts. The price of each pair of pants is the same, and the price of each shirt is the same. Which system of equations can be used to find the price in dollars of each pair of pants, x, and each shirt, y?

Answers

Answer:

A

Step-by-step explanation:

I just took the test

ill give the crown pls <3

Answers

Answer:

Below

Step-by-step explanation:

a) [tex]y =\frac{1}{3} \sqrt{x+4}[/tex]

b) [tex]y=4\sqrt{x} +3[/tex]

c) [tex]y=\sqrt{\frac{1}{2} x} -6\\[/tex]

Factor this polynomial completely
x2 - 8x+ 12
O A. (x-2)(x-6)
B. (x + 2)(x-6)
c. (x - 2)(x+6)
D. (x-3)(x - 4)

Answers

Answer:

(x-2)(x-6)

Step-by-step explanation:

We look for two integers which multiply to +12 but add to -8 and we find those numbers by looking at the factors of 12={1,2,3,4,6,12}

We find that by picking 6 and 2,6×2=12 but 6+2 is not -8 so we tweak that as -6 and-2

By so doing, now -6×-2=12,-6+(-2)=-8

so we factor to get (x-2)(x-6)

If there are 360 g of radioactive material with a half life (decreased by half or 50% )of 1 hour, how much of the radioactive material will be left after 4 hours ?

Answers

After 1 hour, 360 g decays to 180 g.

After another hour (total 2 hours), 180 g decays to 90 g.

After another hour (total 3), 90 g decays to 45 g.

After one more (total 4), 45 g decays to 22.5 g.

More quickly, with a half-life of 1 hour, the 360 g of starting material decays to

(360 g) / 2⁴ = 22.5 g

In general, if the half-life is 1 hour, then after n hours, an initial amount A of this substance decays according to

A / 2

It was -5Cin Copenhagen and -12C in Oslo. Which city was colder?

Answers

-12°C is colder than -5°C.

PLEASE HEEELLLPP MEEE!!! MATH!!!

Solve the system of linear equations by subtraction!

Please and thank you!!!!

Answers

Answer:

( 5, 2)

Step-by-step explanation:

solve by subrtaction

x -2y = 1

-x -4y = -13

-6y = -12 divide both sides by -6

y=2

x-2y=1

x -2*2 =1

x=1+4=5

Answer:

(5,2)

Step-by-step explanation:

x=1+2y and x+4y=13

1+2y+4y=13

y=2

x=1+2*2

x=5

(x,y)=(5,2)

You're welcome!

How do you write 21/30 as a percent?
Please show how to do it :D

Answers

it would be 0.7 lol :)

Answer:

70 %

Step-by-step explanation:

= 21/30 = 0.7

= 0.7 * 100

= 70%

Amelia collected 54 pieces of candy during Halloween. Of those 54 pieces, five-ninths had chocolate in them. Two-thirds of the ones that didn't have chocolate were gum. How many pieces of the 54 were gum? Show how you found your answer.





plz help me ​

Answers

[tex]\frac{5}{9}[/tex] of 54 are the ones which have chocolate , so we need to multiply the fraction by 54

[tex]\frac{5}{9} *54 =30[/tex]

Since 30 pieces of candy have chocolate, then 24 don't have it. [tex]\frac{2}{3}[/tex] of the last number are the ones which have gum, multiply [tex]\frac{2}{3}[/tex] by 24 to get the answer:

[tex]\frac{2}{3} *24=16[/tex]

The answer is : 16 pieces of candy have gum

PLEASE MARK ME AS BRAINLIEST

The number of pieces of gums are 16.

What is the fraction?

In Mathematics, fractions are represented as a numerical value, which defines a part of a whole. A fraction can be a portion or section of any quantity out of a whole, where the whole can be any number, a specific value, or a thing.

Given that, Amelia collected 54 pieces of candy during Halloween.

Of those 54 pieces, five-ninths had chocolate in them.

Number of chocolates = 5/9 ×54

= 30

Remaining candies =54-30

= 24

Two-thirds of the ones that didn't have chocolate were gum.

Now, 2/3 ×24

= 16

Therefore, the number of pieces of gums are 16.

To learn more about the fraction visit:

brainly.com/question/1301963.

#SPJ2

Eric had $15.00 to spend on paints, which sold for $1.14 each. How many jars of paint can he buy?

13

14

15

16

Answers

Answer:

13

Step-by-step explanation:

so you take $15 ÷ $1.14 = 13.15789. so you round it to 13

13 because then it would be 14.82

Four friends bought an extra-large $12 popcorn. Each person bought their own drink. The total cost of the food can be represented by the expression 4x + $12.

Answers

Answer:

True

Step-by-step explanation:

This equation correctly represents the total cost of the food that the friends ended up paying for the popcorn and sodas. In this expression, the cost of each individual soda is represented by the variable x which is multiplied by 4 since each one of the four friend's purchased their own soda. After making this multiplication process that product is added to the initial $12 that they all spent together on the popcorn.

Each friend paid $4 for popcorn.

The total cost of the food can be represented by the expression 4x + $12.

Given

Four friends bought an extra-large $12 popcorn.

Each person bought their own drink.

Let x be the number of friends.

The total cost of food= Total number of friends + cost of popcorn.

The total cost of the food can be represented by the expression 4x + $12.

Therefore;

The amount paid by each friend is;

[tex]\rm 4x=12\\\\x=\dfrac{12}{3}\\\\x=4[/tex]

Hence, each friend paid $4 for popcorn.

To know more about Equation click the link given below.

https://brainly.com/question/2272409

8/11 multiplied by (3/9 - 1/6) divided by 1 5/9
step by step please

Answers

Answer: 6/11

Step-by-step explanation: hello, i hope the screenshot below answers your question

Answer:

0.0779

Step-by-step explanation:

Parentheses first!  3/9 - 1/6 = 6/18 - 3/18 = 3/18

(8/11 × 3/18) ÷ 1 5/9 = 0.0779

best answer=brainiest can someone please explain algebraic expressions?

Answers

Answer: In mathematics, an algebraic expression is an expression built up from integer constants, variables, and the algebraic operations (addition, subtraction, multiplication, division and exponentiation by an exponent that is a rational number). For example, 3x2 − 2xy + c is an algebraic expression.

Step-by-step explanation:

Answer:

An algebraic expression includes variables. Variables are letters that stand for a potential number; most commonly you see x, y, and z used but you can use any letter. Constants are also common in algebraic expressions, and are numbers that are added or subtracted, as well as coefficients, which are what you multiply the variable by.

For example:

3x + 1

Here, the variable is x. The constant is 1. The coefficient is 3.

These are different then other expressions because of the addition of variables. 4 + 4 is not an algebraic expression, but 4x + 4 is.

Algebraic expressions also do not have equal signs, they are not equations.

They can also be more complicated than the ones I've expressed already. 3x^4 + 2x^2 + 4 is an algebraic expression too.

Hope this helps!

1. A 13-ounce package of pistachios costs $5.99. ___________________________

Problems 2-4. Find the unit rate to the nearest cent per ounce. Compare.
2. A 24-ounce box of cornflakes costs $4.59. ___________________________
3. A 36-ounce box of cornflakes costs $5.79. ___________________________
4. Which box is the better buy? ___________________________

1)
2)
3)
4)

Answers

Answer:

1) 1 ounce costs 46 cents. 2) 1 ounce  of cornflakes costs 19 cents ( 0.19125).

3) 1 once cornflakes is 16 cents (0.1608) ( 36-ounces). 4) The 36 ounce box is a better buy.

Step-by-step explanation:

Divide the cost by the number of x units to find the cost of one unit. You are welcome.

HELP ME!

a student measures the length of an object to be 152 cm. what is the measurement in km?

Answers

Answer: 0.00152 km

Step-by-step explanation:

Answer: 0.00152km

Step-by-step explanation:

Lilian purchased a violin form smash music stores. It regularly sold for $670, but wa son slaw for 10% off. She also had to pay 8% sales tax. She bought it on the installment plan and paid 15% of the total cost with tax as a down payment. Her payments were $58 per month for one year.

Answers

Complete question :

Lilian purchased a violin form smash music stores. It regularly sold for $670, but wa son slaw for 10% off. She also had to pay 8% sales tax. She bought it on the installment plan and paid 15% of the total cost with tax as a down payment. Her payments were $58 per month for one year. What is her sales tax?

Answer:

$48.24

Step-by-step explanation:

Given that:

Sales price = 670

Discount = 10% off

Sales tax = 8%

Discounted price = (1 - 0.1) * 670

Discounted price = 0.9 * 670 = $603

Hence, purchase price = $603

Hence, sales tax = 8% of purchase price

8% of $603

0.08 * 603 = $48.24

12y - 15x + 6 please hurry

Answers

Answer: negative 8 or -8

Step-by-step explanation:

would include explanation but it would take a while hope it helped and may i have brainliest please?!

If a bus driver leaves her first stop by 7:00 a.M., her route will take less than 35 minutes. If she leaves after 7:00 a.M., she estimates that the same route will take no less than 43 minutes. Write an inequality which represents the time it takes to drive the route, r.

Answers

Answer:

r < 35 or r ≥ 43

Step-by-step explanation:

We are told that when the bus driver leaves her first stop by 7:00 a.m., her route will take less than 35 minutes.

Since the time it takes to drive the route is r, then;

r < 35

Also, If she leaves after 7:00 a.M., she estimates that the same route will take no less than 43 minutes. Thus;

r ≥ 43

Thus;

r < 35 or r ≥ 43

1+1-1/1+11-1/11=
First to answer gets Brainliest!!

Answers

Answer:11.9090909

Step-by-step explanation:

Answer:

11 10/11

1 + 1 - 1 + 11 - 1/11

12 - 1/11

12x11/11-1/11

132-1/11

131/11

11 10/11

please help I will mark brainliest​

Answers

Answer: look up alaskan pipeline

Step-by-step explanation:

Which expression is NOT equivalent to 6 × 14?

Answers

Answer:

D

Step-by-step explanation:

10(40)= 400

6(400)= 2,400

6(14)= 84

Therefore they are not equal.

Select Correct Answer From Drop Down Menu

Answers

Answer:

Solution  (-3, -5)

systems or linear equations

y = x - 2

y = 3x + 4

Step-by-step explanation:

-2,-2 ( 0,4

Naomi can make 20 tacos in 10 minutes. How many tacos can she make in 1 minute?

Answers

Answer:

2 tacos

Step-by-step explanation:

10 × 2 = 20

1 × 2 = 2

-1t+14=3t+10 what value of t makes this true?​

Answers

Answer:

1 makes this problem true

Step-by-step explanation:

-1t+14=3t+10

-1(1)+14 = 3(1)+10

-1 +14 =3+10 , 13=13

So 1 makes this problem true

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