Extra L’Hôpital’s Rule. Zero divided by zero can not be evaluated, and is an example of indeterminate form. Consider: If we try to evaluate this by direct.

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Presentation transcript:

Extra L’Hôpital’s Rule

Zero divided by zero can not be evaluated, and is an example of indeterminate form. Consider: If we try to evaluate this by direct substitution, we get: In this case, we can evaluate this limit by factoring and canceling:

If we zoom in far enough, the curves will appear as straight lines. The limit is the ratio of the numerator over the denominator as x approaches 2.

L’Hôpital’s Rule: If is indeterminate, then:

Example: If it’s no longer indeterminate, then STOP! If we try to continue with L’Hôpital’s rule: which is wrong, wrong, wrong!

On the other hand, you can apply L’Hôpital’s rule as many times as necessary as long as the fraction is still indeterminate: not (Rewritten in exponential form.)

L’Hôpital’s rule can be used to evaluate other indeterminate forms besides. The following are also considered indeterminate: The first one,, can be evaluated just like. The others must be changed to fractions first.