lady-swillmart:

Anyone want to help with a math problem?

I have:

(5/7 sin⁴ x) - (10/7 sin² x) + (5/7)

I know the answer is (5/7 cos⁴ x) but I can’t fully work out how or why. I know it involves factoring and fundamental identities and all that jazz.

This type of problem (or anything remotely resembling it) is…

http://askmemathsquestions.tumblr.com/post/32670624707

here is your solution