I'm finally starting to understand proving trig identities, but I have just one more that I can't seem to figure out.
secx - tanxsinx = cosx
The Attempt at a Solution
Well first, I multiplied the tanx and sinx and came up with sin2x / cosx
Now I'm stuck. I'm trying to do 1/cosx - sin2x / cosx
Would the GCF be (cosx)(cosx) or just cosx, I'm drawing a blank here. I'm debating whether or not to change the sin2x to 1 - cos2x, but even if I do, I can't figure out how that would simplify to just cosx