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Precalculus Examples

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Solve by Substitution 9x^2+9y^2+85x+18y+9=6x^2-9y^2+50x-18y-9=0

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$

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