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If sin theta sin(2alpha+theta) sin (4alp...

If `sin theta sin(2alpha+theta) sin (4alpha+theta),.......sin(2(n-1)alpha+theta)= (sin theta)/(2n-1)` where `2nalpha=pi` then `cot(theta)+cot(2alpha+theta)+cot(4alpha+theta)+........+cot(2(n-1)alpha+theta))=`

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