Question

Prove: sin θ - sin θ•cos^2 θ = sin^3 θ.
I really don't know where to start. Could someone help explain? Will medal and fan.

Answer 1

have you tried factoring left hand side

Answer 2

I'm very bad with the cos and sin, so I'm not sure where to begin. Could you give me an example?

Answer 3

example of factoring:
\[p-py^2 \\ p(1-y^2)\]

Answer 4

So, in this case, is p - py^2 the same as sin θ - (sin θ•cos^2 θ)

Answer 5

do you that have both terms have the common factor sin(t)?