CPM Homework Help : PC3 Problem 11-36

Show that $\sin(3θ)=3\sin(θ)\cos^2(θ)−\sin^3(θ)$ .

Hint:

$\sin(3θ) = \sin(2θ + θ) = ?$
(Use the angle addition identity for sine.)

More Help:

$\sin(2θ) = 2\sin(θ) \cos(θ)$