Prove
![2 {tan}^{ - 1}x = {tan}^{ - 1} (2x \div (1 - x {}^{2} )) 2 {tan}^{ - 1}x = {tan}^{ - 1} (2x \div (1 - x {}^{2} ))](https://tex.z-dn.net/?f=2+%7Btan%7D%5E%7B+-+1%7Dx++%3D+%7Btan%7D%5E%7B+-+1%7D+%282x+%5Cdiv+%281+-+x+%7B%7D%5E%7B2%7D+%29%29)
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Answer is given in the pic.
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