Calculator technique for evaluating Limits ( Differential Calculus) using Casio 991 es/570 es.

To evaluate a limit as x approaches a certain value "a", substitute a number to "a" that is very close to "a".
For example: x approaches 1, let x= 0.99999 or 1.0001 ; x approaches 2, let x=1.9999 or 2.0001; x approaches 0, let x=0.0001; x approaches infinity, let x= 999999

IMPORTANT: Set the calculator to radian mode (Shift-Mode-Rad) for limits involving trigonometric functions.

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