$\left(-15\right)\::\:\left(-1\right)\:+\:6$
$\lim_{x\to0}\:x^2\sin\left(\frac{1}{x^2}\right)$
$\left(4m\:-\:3n\right)^2$
$\frac{-2a^2}{1}$
$\frac{5x-1}{x-7}>7$
$4x^2+2x+36$
$\frac{dy}{dx}=\frac{\left(x-y\right)}{\left(x+3y\right)}$
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