Limits

Press MENU 9 to access the CAS menu. Then press F2 to access the CALC menu. Press 3 to select 3:lim. Alternatively, after pressing F2, highlight 3:lim, then press EXE. Use the syntax:

limit(expression,variable,value)

Value may be a real number or infinity.

For example, to find , after lim( in the entry line, type:

X ^ 2 – 2 X – 3 , X , 1 ) EXE

The limit is -4.

To find , after lim( in the entry line, type:

1 X , X , OPTN F1 ) EXE

Note that OPTN F1 pastes ° into the entry line. The limit is 0.

After using OPTN, press ESC to return to the main CAS menu.

One also can determine one-sided limits by using the syntax: limit(expression,variable,value,n). To determine a left-sided limit, insert a negative number for n. To determine a right-sided limit, insert a positive number for n. For example, to find , after lim( in the entry line, type:

1 ( X - 4 ) , X , 4 , 1 ) EXE

The limit is infinity.