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[" If "I(n)=int(-pi)^( pi)(sin nx)/((1+p...

[" If "I_(n)=int_(-pi)^( pi)(sin nx)/((1+pi^(x))sin x)dx,n=0,1,2,...," then "],[[" (A) "I_(n)=I_(n+2)," (B) "sum_(n=1)^(10)I_(2n+1)=10 pi," (C) "]]

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