Question

verify the identity.
sinx(cotx+tanx)=secx

i got as afar as
(sinxcosx/sinx )+(sinxcosx/cosx)= 1/cosx

Answer 1

Sinx will cancel in your first term. So you have cosx+ sinx^2/cosx=1/cosx. Combine the fraction on the left side, and you get (osx^2+sinx^2)/cosx=1/cosx. cosx^2+sinx^2=1 by another identity, so you are done.

Answer 2

im lost what's the common denominator?

Answer 3

oh nvm i see