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Prove that : 2 cot^(-1) 5 + cot^(-1) 7+2...

Prove that : `2 cot^(-1) 5 + cot^(-1) 7+2 cot^(-1) 8 = pi/4`.

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2cot^(- 1)5+cot^(- 1)7+2cot^(- 1)8=pi/4

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