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[" 1) "sqrt(" for ")" or frove that ")" ...

[" 1) "sqrt(" for ")" or frove that ")" : "],[[" (i) "tan^(-1)x+cot^(-1)y=tan^(-1)(xy+1)/(y-x)]]

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tan^(-1)x+tan^(-1)y=pi+tan^(-1)((x+y)/(1-xy))

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tan^-1 x + tan^-1y= tan^-1 (frac{x+y}{1-xy} ).

tan^(-1)((x+y)/(1-xy)),xy<1 =