Question

If tan A + tan B + tan A tan B = 1 ,then (A + B) is

Answer 1

Answer:

tana+tanb +tana.tanb=1

tana+tanb=1-tana.tanb

(tana+tanb)/(1-tana.tanb)=1

tan(a+b)=1=tan 45

So a+b=45

Answer 2

Answer:

Answer given above....