Question

Verify cos^3 x sin^7 x = (sin^7 x − sin^9 x)cos x

Screenshot below! Please help!

Answer 1

what they are asking you to do for the first box with the big red X is just to factor out a cosine

Answer 2

or rather i should say factor out \(\cos^2(x)\)

Answer 3

in the NEXT box they want you to put \(1-\sin^2(x)\) because that is what cosine squared is

Answer 4

So the first box is cos^2 (x) ?

Answer 5

Is it using the identity sin^2 x + cos^2 x = 1 ?