[b]1. How do I prove sinxcosxsec^2x=tanx
Homework Equations
sec^2x = tan^2x + 1
The Attempt at a Solution
sinxcosx(tan^2x + 1)
tan^2xsinxcosx +sinxcosx
sin^2x/cos^2x*sinxcosx + sinxcosx - is this valid?
I'm not sure what I've done is even correct - but it doesn't seem...