Question

i need help on this question (cosx)-(cosx)(sin^2x)

Answer 1

HINT: \(\sin^2\theta+\cos^2\theta =1\) so \(\cos^2\theta = 1-\sin^2 \theta\)

Answer 2

cos(x) is common so factor that out first to get cos(x)(1 - sin^2x)

Answer 3

From there, you can apply @geerky42's hint

Answer 4

Actually, what are the instructions for this?

Answer 5

just to simplify

Answer 6

Okay, well, everything above is your hint.

1st Factor
2nd Apply Pythagorean Identity
3rd Simplify

Answer 7

would that come out to -cos^3x?