$\Large\int \frac {dx}{(2-x)\sqrt{1+x}}=$ $$(a)\;2\tan^{-1}\sqrt {1+x}\qquad (b)\;\frac{1}{2}\tan^{-1}\sqrt{1+x}\qquad(c)\;\tan^{-1}\sqrt {1+x}\qquad(d)\;log\bigg\{ \normalsize (2+x)\sqrt{1+x}\bigg\}$$

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