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Evaluate integral of cos(x)^2 with respect to x

Evaluate integral of cos(x)^2 with respect to x
Use the half-angle formula to rewrite as .
Since is constant with respect to , move out of the integral.
Split the single integral into multiple integrals.
Since is constant with respect to , move out of the integral.
Let . Then , so . Rewrite using and .
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Let . Find .
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Rewrite.
Divide by .
Rewrite the problem using and .
Combine and .
Since is constant with respect to , move out of the integral.
The integral of with respect to is .
Simplify.
Replace all occurrences of with .
Simplify the answer.
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Combine and .
Apply the distributive property.
Combine and .
Multiply .
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Multiply and .
Multiply by .
Reorder terms.
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