$\lim_{x\to37}\left(\frac{cos\left(xt\right)-cos\left(37t\right)}{1369-x^2}\right)$
$-28:7.2$
$-15x-3y$
$0.03\cdot\left(0.03\right)^2$
$xy\frac{dy}{dx}=1-x^2$
$\frac{1}{2x+2}-\frac{1}{2}\le\:1$
$2ab-30$
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