To compute multiple integrals, use nested calls to `int`

. For example, compute
the surface area and the volume of a sphere using spherical coordinates.

Compute the expression for the surface area of a sphere. The
distance from the center of a sphere to the surface remains constant, ```
r
= R
```

. The angle *ϕ* changes
its value from `0`

to π.
The angle *χ* changes
its value from `0`

to 2 π:

int(int(R^2*sin(phi), phi = 0..PI), chi = 0..2*PI)

Compute the expression for the volume of a sphere. The angles
accept the same values, but the distance from the center of any point
inside the sphere ranges from `0`

to *R*.
To find the volume, compute the following triple integral:

int(int(int(r^2*sin(phi), r = 0..R), phi = 0..PI), chi = 0..2*PI)

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