Question

secA_1/secA+1=1_cosA/1+cosA

Answer 1

Hope it's will help you

Answer 2

SecA-1/secA+1=1-cosA/1+cosA.

L.H.S.
SecA-1/secA+1.
(1/cosA)-1/(1/cosA)-1
Taking LCM
(1-cosA/cosA)/(1+cosA/cosA)
CosA in the denominator will cancel out each other.and what's left will be
1-cosA/1+cosA which is equal to R.H.S.
Hence, L.H.S.= R.H.S. proved.