Evaluate ` tan^(-1).(1)/(2)+ tan^(-1).(1)/(3)`.

1.	Evaluate ` tan^(-1).(1)/(2)+ tan^(-1).(1)/(3)`.
Answer» `tan^(-1).(1)/(2) + tan ^(-1).(1)/(3)` `=tan ^(-1) .((1)/(2)+(1)/(2))/(1-(1)/(2) xx(1)/(3)) = tan^(-1).(x(x+1)+1)/((x+1)-x)` `=tan^(-1) (x^(2) +x^+1)` = R.H.S

Discussion

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