So! I let w=cosx

1 + 2w = 5w

1=3w

1/3=w, sub w=cosx back in, and we get:

1/3=cosx

But I can't use one of my reference triangles to find exact value for x, so did I do my math wrong? Or am I just missing something?

And another says: Graph f(x)=(1-cos^2X)/(tanx), for x[-2pi,2pi,pi/2], label all minimums and maximums.

But when I graph it on my calculator, there are no minimums or maximums because the graph has asymptotes so it just keeps going, never touching the asymptote (it resembles the tan graph). Uhm..so did I punch it in wrong? I know that tanx=sinx/cosx, does that have something to do with it?