# Math Help - trig identities help?

1. ## trig identities help?

Hello,
I really need help with simplying these terms.thanks...i am having alot of trouble with
..(cosθsin²θ+cos²θsinθ
r³(cosθsin²θ+cos²θsinθ)+rt²(cosθ+sinθ)+rt²(cosθ+si nθ)+r²t)rdrdθdt

2. ## Re: trig identities help?

Originally Posted by n22
Hello,
..(cosθsin²θ+cos²θsinθ[COLOR=#000000][FONT=Lucida Sans Unicode]
I presume this is the part you need help with and I presume you are trying to do an integral, so do the integral over theta using individual terms. Each is a simple substitution problem.

-Dan