Question

Very simple question

Answer 1

Here u go

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Answer 2

Given :

tan A = 1/2

tan B = 1/3

We know that :

( tan A + tan B ) / ( 1 - tan A .tan B )

=> ( 1/2 + 1/3 ) / ( 1 - 1/2 . 1/3 )

=> ( 2 + 3 ) / 6 / ( 1 - 1/6 )

=> (5) / 6 / 5 / 6

=> 1

=> tan 45

=> LHS = RHS

=> tan 45 = tan ( A + B )

=> A + B =45

The value of : A + B = 45°

Hope it helps