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Answer»

(1-x)tan(pie*x)/2 = (1-x)/cot(pie*x)/2 lim x->1 (1-x)/cot(pie*x)/2 if we will put x=1 we will get 0/0 form so using L'hospital rule lim x->1 (-1)/(-cosec(pie*x)/2*cosec(pie*x)/2) = (-1)/(-1) = 1

your answer is wrong



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