The following constants are known to Maple. Some mathematical functions known to Maple. Here are some examples using variables for you to try. The following examples are of calculations using mathematical unknowns. Note that maple will perform some limited simplifications as it deals with a new expression.
Maple can solve an equation for one unknown or more than one unknown.
The command solve can also operate on a set of equations. For functions involving constants such as Pi, you may need to use the evalf operator to get the true floating point representation. Maple has many more functions than can be presented here. Maple will give you a screen full of topics to chose from. In addition to this, the standard Unix manual page is available by typing man maple.