Algebra Examples

$\cos (2 x) = \cos^{2} (x) - \frac{1}{2}$

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$\cos (2 x) = \cos^{2} (x) - \frac{1}{2}$

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