Question

Suppose that sin θ = 1/3 and 0 < θ < π/2.

(a) Compute cos θ.

(b) Compute sin 2θ. Hint: sin 2θ = sin(θ + θ)

Answer 1

there is a picture of an angle \(\theta\) with \(\sin(\theta)=\frac{1}{3}\)

Answer 2

find the other side via pyhagoras
then you can take any trig ratio you like