invalid input: the following extra unknowns found - Maple Help

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Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression

 Description The implicitplot command computes the two-dimensional plot of an implicitly defined curve.   The invalid input: the following extra unknowns were found in the input expression error occurs when an unknown variable in the first argument is passed to the implicitplot command.

Examples

 > $\mathrm{with}\left(\mathrm{plots}\right):$

Example 1

Lowercase $\mathrm{pi}$ is used instead of uppercase $\mathrm{Pi}$.

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Solution:

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Example 2

In the following example, an extra space has been entered between $\mathrm{sec}$and .

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Solution:

Remove the extra space between $\mathrm{sec}$and .

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Example 3

In the following example, the implicitplot command is used incorrectly to plot an equation in three variables.

 > $\mathrm{implicitplot}\left({\left(x+2\right)}^{2}+{\left(y+2\right)}^{2}+{\left(z+2\right)}^{2}=9,x=-5..5,y=-5..5,z=-5..5\right)$

Solution:

Plot the equation in three variables using the plots[implicitplot3d] command

 > $\mathrm{implicitplot3d}\left({\left(x+2\right)}^{2}+{\left(y+2\right)}^{2}+{\left(z+2\right)}^{2}=9,x=-5..5,y=-5..5,z=-5..5\right)$