Question

please solve this....

Answer 1

part A
= 1/ 1+cosA   -   1/cosA-1
= (cosA - 1 - 1 - cosA)  / cos^2A - 1
= -2 / cos^2A - 1
multiplying by (-) sign
= 2 / 1- cos^2A
= 2 / sin^2A

part B
= 2 / sin^2A
  
part C
= 2cosec^2A
= 2 / sin^2A
  
           part A = part B = part C