Let k=1^@ then prove that sum(n=0)^(88)1...

Let `k=1^@` then prove that `sum_(n=0)^(88)1/(cosnkcos(n+1)k)`=`cosk/sin^2k`

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Let k=1^@ , then prove that sum_(n=0)^88 1/(cosnk* cos(n+1)k)=cosk/sin^2k

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