Let k=1^° , then prove that sigma n=0 to 88 1/cosnk×cos(n+1)k = coal/sin^2 k

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Let k=1^° , then prove that sigma n=0 to 88 1/cosnk×cos(n+1)k = coal/sin^2 k

Let k=1^° , then prove that sigma n=0 to 88 1/cosnk×cos(n+1)k = coal/sin^2 k

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Let k=1^° , then prove that sigma n=0 to 88 1/cosnk×cos(n+1)k = coal/sin^2 k

Let k=1^° , then prove that sigma n=0 to 88 1/cosnk×cos(n+1)k = coal/sin^2 k

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