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Find the value of < (br)/k > f(t)=sum(k=...

Find the value of `< (br)/k > f(t)=sum_(k=1)^n sin (2 K t) (cos(n+1)t cos(nt))/(cos t) (sin(n+1)t sin(nt))/(sin t)sin(n+1)tsin(nt)`

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