Question

I want the answer as fast as possible​

Answer 1

Answer:

In a triangle,

A + B + C = 180°

so, B + C = 180° - A

Now,

Tan (B+C/2)= Tan (180-A/2)

Or, Tan (180 - 90/2) = Tan (90/2) = Tan 45° = 1