15. Prove that sin (n + 1)e . sin (n-1) +
cos (n + 1) 0 cos (n - 1) = cos 20, n€z
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Prove that: `sin(n+1)A sin(n+2)A+cos(n+1)A cos(n+2)A ...
YouTube · Doubtnut
Jun 22, 2018
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