int_(0)^( pi)(sin(n+(1)/(2))x)/(2sin(x)/(2))dx

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The value of int_(0)^( pi)(sin(1+(1)/(2))x)/(sin((x)/(2)))dx is,(a) n in I,n>=0(pi)/(2)(b)0(c)pi(d)2 pi

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For any n in N,int_(0)^( pi)(sin^(2)(nx))/(sin^(2)x)dx is equal to