$\frac{d^2}{dx^2}\left(\log\left(e\right)\right)$
$\frac{\tan\left(b\right)}{\sin\left(b\right)}$
$-\left(-19\right)+\left(-48\right)-18$
$\left(2x-5\right)\left(3x+2y\right)$
$2\sqrt[4]{x^7}$
$cos^2\left(15\right)-sin^2\left(15\right)$
$\cos\left(x-y\right)=\frac{1}{2}$
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