As soon as you start typing
a new equation, a check mark will automatically appear in the
corresponding **selection box**. If you want to prevent an equation
from being graphed, then simply uncheck the selection box.

For multiplication, you can
omit the **multiplication sign** (*). For example instead of 2*x you
can simply type 2x. Other examples include 2(x), 2(x+y) and 2xy.

If you want to raise an
expression to a **power** of some number or expression (e.g. x^{2}),
use the ^ key. The equation editor will automatically shift the power part
of the expression up. Press the Enter key to return to the base line.

When typing **functions**
such as sin() or cos(), you only need to type the first letter and the
editor will automatically fill-in the rest. The following table summarized
the functions that are supported:

**Functions** |
**Short keys** |

sin |
s |

cos |
c |

tan |
t |

asin (arcsine) |
as |

acos (arccosine) |
ac |

atan (arctangent) |
at |

abs (absolute
value) |
ab |

log |
l |

e (constant e) |
e |