You can solve single equations and systems of linear and non-linear
equations exactly with the `solve` command. For approximate solutions,
use the `fsolve` command. For ordinary differential equations
use the `dsolve` command. And for recurrence equations use
the `rsolve` command. These commands have the following syntax.

For example, to solve the equation for

> solve( x^3-6*x=5, x ); 1/2 1/2 -1, 1/2 + 1/2 21 , 1/2 - 1/2 21

To solve the ODE given initial conditions and

> dsolve({y(x)+diff(y(x),x$2)=exp(x), y(0)=1, D(y)(0)=0}, y(x)); y(x) = 1/2 exp(x) - 1/2 sin(x) + 1/2 cos(x)

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