设df(x)=(1/(1+x^2)+cos2x+e^3x)dx,则f(x)=

Question

设df(x)=(1/(1+x^2)+cos2x+e^3x)dx,则f(x)=

Answer 1

darctan(x)= 1/(1+x^2) dx
dsin2x = 2cos2x dx
de^(3x)=3e^(3x)dx
所以f(x)= arctanx + 0.5 sin2x + 1/3 e^(3x) +C