1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
solniwko [45]
1 year ago
5

HELP ON THIS PROBLEM!! Solve the following 0deg< x< 360deg: cos x= cos 2x

Mathematics
1 answer:
blsea [12.9K]1 year ago
7 0

Answer:

x=0^\circ,120^\circ,240^\circ,360^\circ

Step-by-step explanation:

<u>Use identities to set the equation up as a quadratic</u>

\cos x=\cos 2x;\:0^\circ \leq x \leq 360^\circ\\\\\cos x=2\cos^2 x-1\\\\0=2\cos^2 x-\cos x-1

<u>Make the substitution u=cos(x) and solve the quadratic</u>

<u />0=2u^2-u-1\\\\0=(2u+1)(u-1)

\displaystyle 0=2u+1\\\\0=2\cos x+1\\\\-1=2\cos x\\\\-\frac{1}{2}=\cos x\\\\120^\circ,240^\circ=x

0=u-1\\\\0=\cos x-1\\\\1=\cos x\\\\0^\circ,360^\circ=x

Hence, x=0^\circ,120^\circ,240^\circ,360^\circ

You might be interested in
Compare Loan Terms
zmey [24]

Answer:

Step-by-step explanation:

the answer is basically 4.5% and the 6%

5 0
2 years ago
Read 2 more answers
14. NUTRITION A cookie contains 9 grams of fat. If you eat no fewer than 4 and no more than 7 cookies, how many grams of fat wil
ra1l [238]
Nbbjk
JVC uf u uh o o
8 0
2 years ago
❗❗❗THERE IS A PICTURE PLEASE ANSWER❗❗❗ SHOW HOW YOU GOT THE ANSWER
Feliz [49]

Answer:

1/2 is poured out and 1 1/2 is left

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
HELP URGENT PLEASE! The Lees have purchased a new home for $360,000, and put a down payment of $50,000 on it. They have a mortga
bonufazy [111]

Answer:

$191,340.80

Step-by-step explanation:

Step 1

We find the amount that is paid monthly by the Lee's

We are told in the question that:

Cost of the house =$360,000

Down payment = $50,000

We are also told, the balance left after the down payment was made = Mortgage that is amortized at an

Interest rate of 5.25%

Time = 20 years

Hence, Mortgage amount = $360,000 - $50,000 = $310,000

Formula for monthly payment =

M= P[r(1+r)^n/((1+r)^n)-1)]

M = the total monthly mortgage payment.

P = the principal loan amount.

r = your monthly interest rate.

= rate/12

=5.25%/12 = 0.0525/12

= 0.004375

n = number of payments

= number of years × number of months

= 20 × 12 = 240 payments

Formula for monthly payment =

M= P[r(1+r)^n/((1+r)^n)-1)]

M = 310,000[0.004375(1 + 0.004375)^240/((1 + 0.004375)^240 ) - 1]

M = $2,088.92

Therefore, the monthly payment by the Lee's is $2,088.92

Step 2

We calculate the Total Amount paid by the Lee's in 20years because we are told in the question that they paid off their mortgage after 20 years

Total Amount paid = Monthly payments × Number of payments

= $2,088.92 × 240

= $501,340.80

Step 3

The third and final step is to calculate the Total interest paid for 20 years

Total Interest = Total amount paid - Mortgage amount

= $501,340.80 - $310,000

Total Interest: $191,340.80

Therefore,the interest will they have paid in total is $191,340.80

6 0
3 years ago
A golfer shot 2 rounds of -4 each and then shot2 rounds of 2 each. What was the golfers composite score?
irakobra [83]

Answer:

Step-by-step explanation:

all answers in here just scroll

Download pdf
<span class="sg-text sg-text--link sg-text--bold sg-text--link-disabled sg-text--blue-dark"> pdf </span>
<span class="sg-text sg-text--link sg-text--bold sg-text--link-disabled sg-text--blue-dark"> pdf </span>
3 0
2 years ago
Other questions:
  • Which systems of equations have no real number solutions? Check all that apply.
    9·2 answers
  • 2 to 6 = 4 to? ??????????
    12·2 answers
  • What are the solution(s) to the quadratic equation x2 - 25 = 0?
    8·1 answer
  • Compressed by a factor
    12·1 answer
  • Can someone help me please
    13·1 answer
  • Fycgvhbkjnlmlmjiohugyftdxzs hi
    12·1 answer
  • Write 640000 in standard form​
    5·2 answers
  • Plz help asap with explanation and will get the brilliant
    6·2 answers
  • A statistics content developer at Aplia wanted to know whether study skills are related to memory quality. She invited student v
    11·1 answer
  • If it is about 240 miles to the international space station, how many kilometers is 240 miles? Round your answer to the nearest
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!