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tan^(-1)1/(11)+tan^(-1)2/(11) is equal t...

`tan^(-1)1/(11)+tan^(-1)2/(11)` is equal to (a) 0 (b) `1//2` (c) -1 (d) none of these

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We have to find
`tan^(-1)(1/(11))+tan^(-1)(2/(11))`
We know that
`tan^(−1)A+tan^(−1)B=tan^(−1)((A+B)/(1-AB))`
Then
`tan^(−1)(1/(11))+tan^(−1)(2/(11))=tan^(−1)(((1/(11))+(2/(11)))/(1-(1/(11))(2/(11))))`
`tan^(−1)(1/(11))+tan^(−1)(2/(11))=tan^(−1)(((1+2)/(11))/(1-2/(121)))`
`tan^(−1)(1/(11))+tan^(−1)(2/(11))=tan^(−1)((3/(11))/((121-2)/(121)))`
...
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