If A and B are acute angle such that tan A=1/2
tan B=1/3 and tan (A + B) = tanA + tanB/1-tanA tanB,find A+B
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tan(A+B)=(1/2+1/3)÷(1-1/2)
=(5/6)÷(1/2)
=10/6
=5/3
A+B=tan^-1(5/3)
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