$2x+x-x-2y$
$\frac{secx+1}{secx-1}=\left(cscx+cotx\right)^2$
$6-4:2-5.3+6:2.2$
$-\:4x^2\:+\:8\:=\:0$
$\frac{dy}{dx}=\frac{xy^3}{\sqrt[2]{1+x^2}}$
$cos\left(70-x\right)$
$\left(+16\right)+\left(-7\right)-\left(-5\right)$
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