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Solve for x: i) tan^(-1)(x+1)+tan^(-1)(...

Solve for `x`: i) `tan^(-1)(x+1)+tan^(-1)(x-1)=tan^(-1)8/31` ii) `tan^(-1)(2+x)+tan^(-1)(2-x)=tan^(-1)2/3` iii) `cos(sin^(-1)x)=1/9` iv) `cos(2sin^(-1)x)=1/9`

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