Question

math help!

Answer 1

Tanx=sinx/cosx
secx=1/cosx
sinx/cosx+1/cosx
sinxcosx+cosx/cosx^2
sinxcosx+cosx/(1-sin^2x)
sinxcosx+cosx/(1+sinx)(1-sinx)
cosx(sinx+1)/(1+sinx)(1-sinx)
cosx/1-sinx

Answer 2

(a^2-b^2)=(a+b)(a-b)
(1-sin^2x)=(1+sinx)(1-sinx)