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Let f(x)={{:(((1-cosx)/((2pi-x)^(2)))((s...

Let `f(x)={{:(((1-cosx)/((2pi-x)^(2)))((sin^(2)x)/(log(1+4pi^(2)-4pix+x^(2)))),:,xne2pi),(" "lambda,:,x=2pi):}`
is continuous at `x=2pi`, then the value of `lambda` is equal to

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