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tan^(-1) ""(2mn)/(m^2-n^2)+ tan^(-1)"" (...

`tan^(-1) ""(2mn)/(m^2-n^2)+ tan^(-1)"" (2pq)/(p^2-q^2)=tan^(-1)"" (2MN)/(M^2-N^2)`
` " where " M = mp - nq , N = np+mq`

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