[SOLVED] help adding and multiplying! trigonometry identities

ok i really dont know what i am supposed to do when part of a problem is
sin2 θ sin θ or

Tan θ + tan2 θ

or 1 - Tan θ x tan2 θ ...

like they arent the problems its just i dont know how i am supposed to add/multiply them... like is it tan sqaaured 2 theta or what?? please help this is causing me alot of trouble. its like index laws but not

If you look at: List of trigonometric identities - Wikipedia, the free encyclopedia

You'll find a lot of trigonometric identities, but focus on the "double angle" formula that converts tan 2x into tan x's

:-) Hope that helps.