Question

please solve karke batao ​

Answer 1

LHS = (1 + cos A)/(1 - cos A); = 1+ 1 sec A 1- 1 sec A = sec A+1 sec A-1; = sec A+1 sec A-1 * sec A-1 sec A-1; = sec^ 2 A-1 (sec A-1)^ 2 = tan^ 2 A (sec A-1)^ 2; sec^ 2 A-1=tan^ 2 A)