Question

please solve this question....it is very urgent

Answer 1

lhs = {tan(180-25)- tan(90+25)}/{1+ tan(180-25)× tan(90+25)}
lhs = {-tan(25)+cot(25)}/{1+ tan(25)× cot(25)}

lhs = {-x+1/x}/{1+1}
lhs = (1-x²)/2x = Rhs

hence proved
ps: tan(180-25) = -tan25
and tan(90+25)= -cot25

Answer 2

here is solution step by step