## Area Functions

An area function f(x, y) is plotted, i.e. the three-dimensional diagram of a function with two
variables. In many area functions, terms are used several times; therefore it is possible to define
a term u(x, y) separately and to use it as a u in the function term.

### Example:

a) f(x,y) = sin(u)/u
u(x,y) = sqr(x*x+y*y)
-8 ≤ x ≤ 8 ; -8 ≤ y ≤ 8 ; -0,5≤z≤1,5
| |

a) f(x,y) = abs(sin(x)) + abs(cos(x))
1 ≤ x ≤ 8 ; 1 ≤ y ≤ 8 ; 0≤z≤2
| |

### See also:

Supported Functions
Adjusting the Coordinate System