Question

If A + B + C = 45°, the find the value of /sigma(tanA + tanB + tanC).

Answer 1

It's tan 45 = 1
As A + B + C = 45
Let A=B=C=X
then 3 X = 45
X is 15
(Tan 15 ) 3 = tan 45 which is 1

Answer 2

Answer:

1 + pi tanA

or

1 + tanA tanB tanC