Evaluate integral of x square root of 4-9x^2 with respect to x

Math
Let . Then , so . Rewrite using and .
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Let . Find .
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Differentiate .
By the Sum Rule, the derivative of with respect to is .
Since is constant with respect to , the derivative of with respect to is .
Evaluate .
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Since is constant with respect to , the derivative of with respect to is .
Differentiate using the Power Rule which states that is where .
Multiply by .
Subtract from .
Rewrite the problem using and .
Simplify.
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Move the negative in front of the fraction.
Combine and .
Since is constant with respect to , move out of the integral.
Since is constant with respect to , move out of the integral.
Rewrite as .
By the Power Rule, the integral of with respect to is .
Simplify.
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Simplify.
Simplify.
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Combine and .
Multiply and .
Multiply by .
Factor out of .
Cancel the common factors.
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Replace all occurrences of with .
Evaluate integral of x square root of 4-9x^2 with respect to x

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