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multiplicative inverse

The reciprocal of a number. The product of a number and its reciprocal is $1$ . Example: $a \cdot (\frac{1}{a}) = (\frac{1}{a}) \cdot a = 1$ .

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