Calculus Examples

Find the Critical Points f(x)=1/(x^2+1)
Step 1
Find the first derivative.
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Step 1.1
Find the first derivative.
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Step 1.1.1
Rewrite as .
Step 1.1.2
Differentiate using the chain rule, which states that is where and .
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Step 1.1.2.1
To apply the Chain Rule, set as .
Step 1.1.2.2
Differentiate using the Power Rule which states that is where .
Step 1.1.2.3
Replace all occurrences of with .
Step 1.1.3
Differentiate.
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Step 1.1.3.1
By the Sum Rule, the derivative of with respect to is .
Step 1.1.3.2
Differentiate using the Power Rule which states that is where .
Step 1.1.3.3
Since is constant with respect to , the derivative of with respect to is .
Step 1.1.3.4
Simplify the expression.
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Step 1.1.3.4.1
Add and .
Step 1.1.3.4.2
Multiply by .
Step 1.1.4
Simplify.
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Step 1.1.4.1
Rewrite the expression using the negative exponent rule .
Step 1.1.4.2
Combine terms.
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Step 1.1.4.2.1
Combine and .
Step 1.1.4.2.2
Move the negative in front of the fraction.
Step 1.1.4.2.3
Combine and .
Step 1.1.4.2.4
Move to the left of .
Step 1.2
The first derivative of with respect to is .
Step 2
Set the first derivative equal to then solve the equation .
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Step 2.1
Set the first derivative equal to .
Step 2.2
Set the numerator equal to zero.
Step 2.3
Divide each term in by and simplify.
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Step 2.3.1
Divide each term in by .
Step 2.3.2
Simplify the left side.
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Step 2.3.2.1
Cancel the common factor of .
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Step 2.3.2.1.1
Cancel the common factor.
Step 2.3.2.1.2
Divide by .
Step 2.3.3
Simplify the right side.
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Step 2.3.3.1
Divide by .
Step 3
Find the values where the derivative is undefined.
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Step 3.1
The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.
Step 4
Evaluate at each value where the derivative is or undefined.
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Step 4.1
Evaluate at .
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Step 4.1.1
Substitute for .
Step 4.1.2
Simplify.
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Step 4.1.2.1
Simplify the denominator.
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Step 4.1.2.1.1
Raising to any positive power yields .
Step 4.1.2.1.2
Add and .
Step 4.1.2.2
Divide by .
Step 4.2
List all of the points.
Step 5