prove that $\displaystyle tan(2\tan^{-1}x) = 2tan(\tan^{-1}x+\tan^{-1}x^3) $ Thanks
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Originally Posted by differentiate prove that $\displaystyle tan(2\tan^{-1}x) = 2tan(\tan^{-1}x+\tan^{-1}x^3) $ Thanks Dear differentiate, $\displaystyle tan(A+B)=\frac{tanA+tanB}{1-tanAtanB}$ Use this formula and simplify both sides seperately. Hope you could continue from here!!
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