Evaluate the integrals (a) I= int_(-[infinity][infinity] ) (xsinxdx)/(x²-2x+10) (b) I= int_0[infinity] (dx)/((x²+1)²) (c) I= int_0[infinity] (coscxdx)/((x²+a²)(x²+b²)),{(:[a!=b,c>0