Question

TanA+TanB+TanA*TanB=1 then A+B=

Answer 1

A + B = 45. By taking A = 0 and B = 45

Answer 2

Tan(a+b) =(tan a +tan b) /(1-(tan a tan b))

hence a+b will be 45 degree

Tann 45=1 =( tan a +tan b) /(1-tan a tan b)

Or tan a +tan b=1 - tan a tan b

Or tan a+tan b+tan a tan b =1

Hence 45 degree will be the answer

This is not a good prove but u can think in this way