throw(logic_error("differentiation with respect to dummy variable"));
return b.diff(s)*f.subs(x==b)-a.diff(s)*f.subs(x==a)+integral(x, a, b, f.diff(s));
}
throw(logic_error("differentiation with respect to dummy variable"));
return b.diff(s)*f.subs(x==b)-a.diff(s)*f.subs(x==a)+integral(x, a, b, f.diff(s));
}