Applications of Derivatives
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AP Calculus BC › Applications of Derivatives
Evaluate the limit using L'Hopital's Rule.
Undefined
Explanation
L'Hopital's Rule is used to evaluate complicated limits. The rule has you take the derivative of both the numerator and denominator individually to simplify the function. In the given function we take the derivatives the first time and get
.
This still cannot be evaluated properly, so we will take the derivative of both the top and bottom individually again. This time we get
.
Now we have only one x, so we can evaluate when x is infinity. Plug in infinity for x and we get
and
.
So we can simplify the function by remembering that any number divided by infinity gives you zero.
Explanation
Evaluate the limit using L'Hopital's Rule.
Undefined
Explanation
L'Hopital's Rule is used to evaluate complicated limits. The rule has you take the derivative of both the numerator and denominator individually to simplify the function. In the given function we take the derivatives the first time and get
.
This still cannot be evaluated properly, so we will take the derivative of both the top and bottom individually again. This time we get
.
Now we have only one x, so we can evaluate when x is infinity. Plug in infinity for x and we get
and
.
So we can simplify the function by remembering that any number divided by infinity gives you zero.
Explanation
Explanation
Explanation
Find the
.
Does Not Exist
Explanation
Subbing in zero into will give you
, so we can try to use L'hopital's Rule to solve.
First, let's find the derivative of the numerator.
is in the form
, which has the derivative
, so its derivative is
.
is in the form
, which has the derivative
, so its derivative is
.
The derivative of is
so the derivative of the numerator is
.
In the denominator, the derivative of is
, and the derivative of
is
. Thus, the entire denominator's derivative is
.
Now we take the
, which gives us
.
Find the limit if it exists
Hint: Use L'Hospital's rule
Explanation
Directly evaluating for yields the indeterminate form
we are able to apply L'Hospital's rule which states that if the limit is in indeterminate form when evaluated, then
As such the limit in the problem becomes
Evaluating for yields
As such
and thus
Find the limit if it exists
Hint: Use L'Hospital's rule
Explanation
Directly evaluating for yields the indeterminate form
we are able to apply L'Hospital's rule which states that if the limit is in indeterminate form when evaluated, then
As such the limit in the problem becomes
Evaluating for yields
As such
and thus
Find the
.
Does Not Exist
Explanation
Subbing in zero into will give you
, so we can try to use L'hopital's Rule to solve.
First, let's find the derivative of the numerator.
is in the form
, which has the derivative
, so its derivative is
.
is in the form
, which has the derivative
, so its derivative is
.
The derivative of is
so the derivative of the numerator is
.
In the denominator, the derivative of is
, and the derivative of
is
. Thus, the entire denominator's derivative is
.
Now we take the
, which gives us
.