$4x^{2-9}$
$\frac{dy}{dx}-4xy=\frac{5x}{4}$
$f\left(x\right)=\left(\frac{1}{x}-\frac{4}{x^3}\right)\left(x^3-5x-1\right)$
$\sqrt{1}+5$
$\frac{1x-3y}{3}+\frac{1x+3y}{3}$
$\tan\left(x\right)\cos^2x\:-\tan\left(x\right)$
$\lim_{x\to\infty}\:\frac{\left(x^2+x-12\right)}{x^2-9}$
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