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tan^(-1)3 + tan^(-1) lambda = tan^(-1) {...

`tan^(-1)3 + tan^(-1) lambda = tan^(-1) {(3+ lamda)/(1- 3 lamda)}` is valid for what values of `lambda` ?
A) `lambda in (-1/3,1/3)`
B) `lambda gt (1/3)`
C) `lambda lt (1/3)`
D) all real values of `lambda`

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