If In=int-pi^pi (sinnx)/((1+pi^x)sinx)dx...

If `I_n=int_-pi^pi (sinnx)/((1+pi^x)sinx)dx, n=0,1,2, …,` then (A) `I_n=I_(n+2)` (B) `sum_(m=1)^10 I_(2m+1)=10pi` (C) `sum_(m=1)^10 I_(2m)=0` (D) `I_n=I_(n+1)`

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