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Assertion (A) sum _(r=1)^(n-1) cos^2((rpi)/(n))=(n)/(2)-1 Reasion (R) : cos alpha+ cos (alpha+ beta)+cos(alpha+2 beta)+....+cos (alpha(n-1) beta)=(sin(n beta//2))/(sin(beta//2)). Cos ((2 alpha+(n-1) beta)/(2)) |
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Answer» A is TRUE, R is true and R is CORRECT explanation of A |
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