Question

FAN and MEDAL! :)




Prove: sin θ - sin θ•cos^2 θ = sin3 θ. You must show all work.

I think I use the Pythagorean Identity with this one?

Answer 1

I think you're right :)

Answer 2

But in case you need reassurance, try eliminating a common factor and see if the remaining terms look familiar

Answer 3

shouldn't it be sin^3 θ not Sin 3θ ??

Answer 4

Oh sorry about that. I forgot to fix it so it read as an exponent >_< sin^3 θ

Answer 5

Should I divide by sin θ to make it all 1 - cos^2 θ = sin^2 θ?
Ohh so it'll be sin^2 θ + cos^2 θ = 1 when i move the cos around.

Answer 6

Thanks guys :) Sorry I cant give out more than 1 medal.

Answer 7

haha it's alright