Question

cos θ - cos θ sin^2θ

Answer 1

\[\cos θ - \cos θ \sin^2θ\]\[\cos θ(1 - \sin^2θ)\]\[\cos θ(\cos^2θ)\]\[\cos^3θ\]

Answer 2

how do you do the second part? cosθ(1−sin2θ)

Answer 3

I used the rule,
\[\sin^2θ+\cos^2θ=1\]from this rule, if you subtract sin²θ from both sides, you get
\[1-\sin^2θ=\cos^2θ\]

Answer 4

ohhhh right got it thank you