$x^2+x-2<16$
$\frac{dy}{dx}+\frac{2}{x}y=\frac{e^x}{x^2}$
$\left(+38\right)-\left(+9\right)-\left(-7\right)$
$f\left(x\right)=\sqrt{5x}$
$ln\:\left(\frac{a}{b}\right)=-x$
$\lim_{x\to0}\:\frac{\tan\left(x\right)}{x}.\cos\left(x\right)$
$-23xy+16x^2y+54xy^2-48xy$
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