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[" 3.Prove that "(cosh2x-1)/2=sinh^(2)x]...

[" 3.Prove that "(cosh2x-1)/2=sinh^(2)x],[" 4.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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