Update \point command

[grote-beer]

When defining a point I noticed that I could use sine in only one of the coordinate values at the time but not both

For example: \point{a}{1}{sin(15)} and \point{a}{cos(15)}{1} would work but \point{a}{cos(15)}{sin(15)} doesn't.

This change fixes that issue

[hackl]

Thank you very much for the update of the point function.