Mathematics

Mathematics

Problem

2tan⁡(tan⁡−1(x)+tan⁡−1(x3))2 \tan(\tan^{-1}(x) + \tan^{-1}(x^3)) where x∈R−{−1,1}x \in R - \{-1, 1\} is equal to a. 2x1−x2\frac{2x}{1-x^2} b. tan⁡(2tan⁡−1x)\tan(2 \tan^{-1} x) c. tan⁡(cot⁡−1(−x)−cot⁡−1(x))\tan(\cot^{-1}(-x) - \cot^{-1}(x)) d. tan⁡(2cot⁡−1x)\tan(2 \cot^{-1} x)

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