$3\tan^2\left(x\right)+\sec^2\left(x\right)+1=0$
$-4\left(2b+6\right)=-4b$
$-2xym-2xyn$
$8-2\sqrt{x}$
$\sqrt[4]{1+0.2195121951}-1$
$\frac{dy}{dx}=y^3-2y$
$9\cdot30$
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