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" 29.Prove that: "cot^(-1)7+cot^(-1)8+co...

" 29.Prove that: "cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)3

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Prove that: cot^(-1)7+cot^(-1)18=cot^(-1)5 .

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