$2\left(-3\right)^2-2$
$\sec\left(x\right)-\tan\left(x\right)\sin\left(x\right)=\frac{1}{\sin\left(x\right)}$
$458,12\:x\:256,45$
$\left(-2.5\:-\:8.1\right)$
$4x^2-64=0$
$\frac{dy}{dx}=\frac{4}{\sqrt{x+2}}y\left(0\right)=5$
$9xy+7x+4x-5xy+2x$
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