Question

please do this sum please

Answer 1

$taking \: lhs \\ \frac{ \sec(a) - 1}{seca + 1} \\ \frac{ \frac{1}{ \cos(a) } - 1 }{ \frac{1}{ \cos(a) } + 1 } \\ \frac{1 - \cos(a) }{1 + \cos(a) }$
LHS=RHS

Answer 2

here is your answer....