Let `k=1^@` then prove that `sum_(n=0)^(88)1/(cosnkcos(n+1)k)`=`cosk/sin^2k`
175 views · Published 12 October 2018 · 3:44 · Indexed 28 September 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW Let `k=1^@` then prove that `sum_(n=0)^(88)1/(cosnkcos(n+1)k)`=`cosk/sin^2k`
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