Question

prove that (cotA-1)/(2-sec^2A)=cotA/(1+tanA)

Answer 1

cotA-1/1-$tan^{2}$A

=( cotA -1)$cot^{2}$A /( $cot^{2}$A-1)

=$cot ^{2}$A/(cotA+1)

= cotA/ 1+tanA