Question

Write the expression as one involving only sin (theta) and cos (theta)
Sin 2(theta) + cos(theta)

Answer 1

\[Sin^2θ+Cosθ\]

Answer 2

What do you have to do with this?

Answer 3

Use this identity:
\[\sin 2\theta=2 \sin \theta \cos \theta \]

Answer 4

hold on is it \[Sin^2θ+Cosθ~~~~~~~~or~~~~~~~~~~Sin2θ+Cosθ\]

Answer 5

@SolomonZelman Sin2θ+Cosθ
@mertsj how did youget that?

Answer 6

So it's the second one?

Answer 7

@SolomonZelman yes

Answer 8

\[Use~~this:~~~~~~~~~~~~~~~~~~Sin~2θ~=~2Sin~θ~Cos~θ\]

Answer 9

@solomonzelman what is that?

Answer 10

An identity.

Answer 11

i dont think my teacher taught us that identity yet

Answer 12

So you are not allowed to use it because of that?

Answer 13

oh nevermind i did learn it... well i have it written down on my plate... thanks

Answer 14

Good.