> Int( x/(x^3-1), x)=int( x/(x^3-1), x );
> Int( x^2*sin(5*x), x)=int( x^2*sin(5*x), x );
> Int( x/(x+sqrt(x)), x)=int(x/(x+sqrt(x)), x );
> Int( cos(x)*sin(x),x)=int(cos(x)*sin(x),x);
> Int( ln(x), x)=int(ln(x), x );