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
pshichka [43]
3 years ago
14

How do I solve 2cos(x)=2sin(2x)

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
4 0
2cosx=2sin2x. Sin2x is an identity for 2sinxcos. So 2[2sinxcosx] gives you 4sinxcosx. 2cosx=4sinxcosx. Divide 2cosx on both sides and gives you 2sinx=0 and divide again, sinx=0. Sinx is 0 at 0 and 360 degrees, or pi and 2pi. So thats what x would be. 0,360,pi,2pi.
You might be interested in
P P,Q and R can finish a task in 8, 10 and 12 hours respectivly.They started working together but after 3 hours, P and R left. H
zimovet [89]

Answer:

45 minutes

Step-by-step explanation:

Assume task completed in total x hours

\frac{x}{10} + \frac{3}{8} + \frac{3}{12} = 1 \\ 12x + 45 + 30 = 120 \\ 12x = 45 \\ x = \frac{15}{4} = 3 \frac{3}{4}

So q will take 45 more minutes

7 0
2 years ago
Abana deposits $1000 each year into a savings account earning 2% intrest .how much after 3 years
ladessa [460]
$60, Because 2% of $1000 is $20, and 20 x 3 is 60.

8 0
2 years ago
7. Explain the difference between whole numbers and counting numbers.<br>(2 marks)<br>Your answer​
Burka [1]

Counting numbers is like the numbers 1,2,3,4,5 and so on they were numbers you were probably taught to count to like to count through 1-10 or whatever. Counting numbers mean to count since they do have the word counting in them.

Whole number just means a number with no fraction or intger also 1 - infinity

3 0
3 years ago
Write in standard form <br><br><br>5.13 x 10₇<br><br>*please help me*
mafiozo [28]

In the standard form, the number 7 here should be an exponent not a sub text.

Answer: 5.13 x 10^(7).

Done!

4 0
3 years ago
Why is the absolute value of a number always positive?
Goshia [24]
Because the number is positive
8 0
3 years ago
Read 2 more answers
Other questions:
  • Simplify (-2) ^2 + |-15| ÷ 3
    7·2 answers
  • the falcon has been clocked in a dive at 200 miles per hour. How many feet per second did the bird travel?
    8·2 answers
  • Translation of the length of a rectangle is 2 feet greater than twice its width. If the perimeter is 25 feet, fine the width
    7·1 answer
  • Seven thents of a number plus 14 is less than forty nine
    10·2 answers
  • In CAT entrance examination paper there are 3 sections, each containing 5 questions. A candidate has to solve 5,
    13·1 answer
  • In ΔKLM, the measure of ∠M=90°, the measure of ∠K=78°, and KL = 35 feet. Find the length of MK to the nearest tenth of a foot.
    8·2 answers
  • Binomial Theorem
    10·1 answer
  • Using the Histogram below, how many trees are between 150 cm and 200 cm tall?
    10·1 answer
  • Help im almost finished
    12·1 answer
  • Haiiiii i need help with this question pls!! what is the distance between (3,3) and (-5,-2)
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!