Given that f(ntheta)=(2sin2theta)/(cos2t...

Given that `f(ntheta)=(2sin2theta)/(cos2theta-cos4ntheta),` and `f(theta)+f(2theta)+f(3theta)++f(ntheta)=(sinlambdatheta)/(sinthetasinmutheta),` then the value of `mu-lambda` is ______

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