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change of base formula

If $a$ , $b$ , and $x$ are positive, $a \neq 1$ , and $b \neq 1$ , then: $\log_{b} (x) = \frac{\log_{a} (x)}{\log_{a} (b)}$ .

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