$-14x^2+x+3$
$\int\left(x^3+3x^2+2x\right)e^{1-2x}dx$
$\frac{cotx}{1+cscx}-\frac{cotx}{1-cscx}=2secx$
$\frac{dy}{dx}=\frac{\left(1-3y\right)^2}{x}$
$\frac{x-6}{x-1}\ge-1$
$\lim_{x\to0}\left(\frac{\sqrt{a^2\:+\:x^2}-\sqrt{a^2-x^2}}{x^2}\right)$
$131-x=244$
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