Define the same sphere but without the names of the axes in the input; you will be prompted for them.
Define the same sphere where the names of the axes are assigned using the three environment variables.
In the above examples, c is assigned to a geometric object (sphere), c can also be assigned to a list of objects.
intersection: "two points of intersection"
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The following is an example with unknown parameters, which returns the message FAIL.
IsOnObject: "hint: unable to determine if a^2+1 is zero"
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