# will award best answer circular functions help?

if: pi < θ < 3pi/2 and sinθ = -2/3, find sin20

a) -4sqrt5/9

b) -4/3

c) 1/3

d) 4sqrt5/9

### 1 Answer

Relevance

- rotchmLv 76 months agoFavorite Answer
sin(2θ) = 2 sin(θ)cos(θ), right?

You are given sin(θ) and you are told in what quadrant θ is.

Thus, what is the value of cos(θ)? Then just compute 2 sin(θ)cos(θ).

Done!

Still have questions? Get your answers by asking now.