$a^{\:5}.a^2.b^3$
$a^2b^2-9x^6$
$y'=\sin x\:+e^x-5x$
$\frac{d}{dx}\left(\frac{x^2\left(x-6\right)^9}{\left(x^2+6\right)^4}\right)$
$a+9=\frac{18}{a}+2$
$\lim_{x\to\infty}\left(\frac{2\sin^2x}{x\cos^2x}\right)$
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