restart;
f:=int(sqrt(tan(x)),x);
g:=diff(f,x);
h:=sqrt(tan(x));
plot(h,x=0..Pi/2,y=0..5);
plot(h,x=0..3*Pi/2,y=0..5);
plot(g,x=0..3*Pi/2,y=0..5);
simplify(g);
plot(1+h-g,x=0..Pi/3,y=-5..5);
simplify(h-g);
f2:=int(exp(x)/arctan(x),x);
diff(f2,x);
f3:=int(exp(x)/arctan(x),x=1..t);
diff(f3,t);
plot(exp(x)/arctan(x),x=1..2);
A2:=int(exp(x)/arctan(x),x=1..2);
evalf(A2);
Digits:=50;
evalf(A2);
Digits:=10;
int(1/sqrt(1+x^2),x);
A3:=int(1/sqrt(1+x^2),x=0..5);
evalf(A3);