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L’ Hospital’s Rule is considered one the most difficult concept.
189 Questions around this concept.
If
is
If is a differentiable function in the interval (0, ∞) such that
= 1 and
for each
, then
is equal to :
Using the method of L’ Hospital, evaluate the limit :
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L’Hospital’s Rule
L’Hospital’s Rule states that, if , then differentiate numerator and denominator till this intermediate form is removed.
i.e.,
But, if we again get the indeterminate form , then,
(so we differentiate numerator and denominator again)
And this process is continued till the indeterminate form is removed.
Note:
We do not use quotient rule of differentiation here. Numerator and denominator have to be differentiated separately.
Some Application of L’Hospital’s Rule.
Note:
In some cases, L’Hospital’s Rule fails to evaluate limit
For example,
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