To compute a multiple integral such as

use
int( x+y^2, y=0..x ); int( ", x=1..2 );Sometimes Maple is unable to compute the exact value of an integral in such cases an approximate value is desired. e.g. if we need

we would use
int( sin(x+y^3), y=0..x ); Maple is unable to compute it int( ", x=1..2 ); Maple returns the symbolic form of the integral evalf( ", 5); Approximate the double integral to 5 digitsIf you are certain you want only the approximate value, it is faster to use Int instead of int because on using Int Maple will not attempt to compute the exact value of the integrals. Try it.