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The value of 2tan^(-1)(cos e ctan^(-1)x-...

The value of `2tan^(-1)(cos e ctan^(-1)x-tancot^(-1)x)` is equal to (a)`cot^(-1)x` (b) `cot^(-1)1/x` (c)`tan^(-1)x` (d) none of these

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