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
r-ruslan [8.4K]
3 years ago
13

How do you simplify sin2x=cosx

Mathematics
1 answer:
torisob [31]3 years ago
4 0
          sin(2x) = cos(x)
2sin(x)cos(x) = cos(x)  Expand sin(2x).
     2cos(x)      2cos(x) Divide 2cos(x) on each side.
            sin(x) = ¹/₂
    sin⁻¹[sin(x)] = sin⁻¹(¹/₂)   Use sin⁻¹(x) on each side.
                   x = 30, 150  Find the answer.
You might be interested in
HHHHHHEEEELLLLLLPPPPP
sveticcg [70]
<span>We want to check how many intersections line A and B have, that is, we want to check how many common solutions do these equations have:
</span>
i) 2x + 2y = 8

ii) x + y = 4
<span>
use equation ii) to write y in terms of x as : y=4-x, 

substitute y =4-x in equation i):

</span>2x + 2y = 8
2x + 2(4-x) = 8
<span>2x+8-2x=8
8=8

this is always true, which means the equations have infinitely many common solutions.


Answer: </span><span>There are infinitely many solutions.</span><span>

</span>
4 0
3 years ago
Help me please question is attached in photo below
lora16 [44]

Answer:

P = 4x - 2

Step-by-step explanation:

Perimeter is all the side lengths added together.

Step 1: Set up expression

P = 2x - 5 + 5 - x + 3x - 2

Step 2: Combine like terms

P = 4x - 2

4 0
3 years ago
Karl is buying a new car. At Bank A, a car loan will cost him 11.5%. At Bank B, it will cost 12.25%. If he borrows $8,000, how m
Brums [2.3K]
Karl is saving $60

8,000*0.115= 920

And, 8,000*0.1225= 980

 
5 0
3 years ago
Read 2 more answers
the formula for the perimeter of a triangle is the same as that for the circumference of a circle true or false
lys-0071 [83]

FALSE

To calculate the perimeter of a triangle, add the length of its sides. For example, if the sides of a triangle are a, b, and c, the perimeter of the triangle is P = a + b + c.

Since all three sides of the triangle are the same length, you can multiply the length of each side by 3 to get the perimeter.

To find the circumference of a circle, multiply the diameter of the circle by π (pi). The circumference can also be calculated by multiplying 2 x radius by pi (π = 3.14).

Learn more about the circumference of a circle here:brainly.com/question/23986334

#SPJ4

6 0
2 years ago
Help plss
gregori [183]

Answer:

is this have picture so I solve

3 0
3 years ago
Read 2 more answers
Other questions:
  • What’s nine plus ten
    6·2 answers
  • Estamate 12871+6281+5146 by first rounding each number to the nearest thousand.
    9·1 answer
  • A loan of $8,000 is paid back in two years in monthly payments of $400. The percentage interest on the loan was
    11·1 answer
  • When five times a number is decreased by 9​, the result is 11. What is the​ number?
    7·2 answers
  • The force of gravity between two objects is given by  Fg =
    15·2 answers
  • Please answer quickly, help is URGENT<br><br> (see attached image) <br> TIA
    7·1 answer
  • BRAINLIEST FOR FIRST ANSWER!!!
    8·2 answers
  • A researcher conducts a hypothesis test using a sample of n = 40 from an unknown population. What is the df value for the t stat
    12·1 answer
  • Amelie rode her bike for 80 minutes. Amelie rode her bike 5 times as long as Raj. How long did Raj ride his bike?
    15·2 answers
  • Help me, plsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!