Calculus Examples

Graph ( natural log of x)/(e^x)
Step 1
Find the asymptotes.
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Step 1.1
Find where the expression is undefined.
Step 1.2
Since as from the left and as from the right, then is a vertical asymptote.
Step 1.3
Evaluate to find the horizontal asymptote.
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Step 1.3.1
Apply L'Hospital's rule.
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Step 1.3.1.1
Evaluate the limit of the numerator and the limit of the denominator.
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Step 1.3.1.1.1
Take the limit of the numerator and the limit of the denominator.
Step 1.3.1.1.2
As log approaches infinity, the value goes to .
Step 1.3.1.1.3
Since the exponent approaches , the quantity approaches .
Step 1.3.1.1.4
Infinity divided by infinity is undefined.
Undefined
Step 1.3.1.2
Since is of indeterminate form, apply L'Hospital's Rule. L'Hospital's Rule states that the limit of a quotient of functions is equal to the limit of the quotient of their derivatives.
Step 1.3.1.3
Find the derivative of the numerator and denominator.
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Step 1.3.1.3.1
Differentiate the numerator and denominator.
Step 1.3.1.3.2
The derivative of with respect to is .
Step 1.3.1.3.3
Differentiate using the Exponential Rule which states that is where =.
Step 1.3.1.4
Multiply the numerator by the reciprocal of the denominator.
Step 1.3.1.5
Multiply by .
Step 1.3.2
Since its numerator approaches a real number while its denominator is unbounded, the fraction approaches .
Step 1.4
List the horizontal asymptotes:
Step 1.5
No oblique asymptotes are present for logarithmic and trigonometric functions.
No Oblique Asymptotes
Step 1.6
This is the set of all asymptotes.
Vertical Asymptotes:
Horizontal Asymptotes:
Vertical Asymptotes:
Horizontal Asymptotes:
Step 2
Find the point at .
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Step 2.1
Replace the variable with in the expression.
Step 2.2
Simplify the result.
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Step 2.2.1
The natural logarithm of is .
Step 2.2.2
Divide by .
Step 2.2.3
The final answer is .
Step 2.3
Convert to decimal.
Step 3
Find the point at .
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Step 3.1
Replace the variable with in the expression.
Step 3.2
The final answer is .
Step 3.3
Convert to decimal.
Step 4
Find the point at .
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Step 4.1
Replace the variable with in the expression.
Step 4.2
The final answer is .
Step 4.3
Convert to decimal.
Step 5
The log function can be graphed using the vertical asymptote at and the points .
Vertical Asymptote:
Step 6