Calculus Examples

Evaluate the Integral integral from 0 to pi/4 of cos(2x)sin(sin(2x)) with respect to x
Step 1
Let . Then , so . Rewrite using and .
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Step 1.1
Let . Find .
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Step 1.1.1
Differentiate .
Step 1.1.2
Since is constant with respect to , the derivative of with respect to is .
Step 1.1.3
Differentiate using the Power Rule which states that is where .
Step 1.1.4
Multiply by .
Step 1.2
Substitute the lower limit in for in .
Step 1.3
Multiply by .
Step 1.4
Substitute the upper limit in for in .
Step 1.5
Cancel the common factor of .
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Step 1.5.1
Factor out of .
Step 1.5.2
Cancel the common factor.
Step 1.5.3
Rewrite the expression.
Step 1.6
The values found for and will be used to evaluate the definite integral.
Step 1.7
Rewrite the problem using , , and the new limits of integration.
Step 2
Simplify.
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Step 2.1
Combine and .
Step 2.2
Combine and .
Step 3
Since is constant with respect to , move out of the integral.
Step 4
Let . Then , so . Rewrite using and .
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Step 4.1
Let . Find .
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Step 4.1.1
Differentiate .
Step 4.1.2
The derivative of with respect to is .
Step 4.2
Substitute the lower limit in for in .
Step 4.3
The exact value of is .
Step 4.4
Substitute the upper limit in for in .
Step 4.5
The exact value of is .
Step 4.6
The values found for and will be used to evaluate the definite integral.
Step 4.7
Rewrite the problem using , , and the new limits of integration.
Step 5
The integral of with respect to is .
Step 6
Evaluate at and at .
Step 7
The exact value of is .
Step 8
Simplify.
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Step 8.1
Evaluate .
Step 8.2
Multiply by .
Step 8.3
Add and .
Step 8.4
Combine and .
Step 8.5
Divide by .