$30\:-\:20\::\:5\:+\:15$
$\frac{2^{6n}}{6^{2n}}\left(\frac{x}{3}\right)^n$
$\frac{d}{dx}\left(ln\left(\left(p+1\right)^2\left(p+2\right)^3\left(p+3\right)^4\right)\right)$
$-6x^2-6x\:-\:6$
$9\cdot2+12+36$
$\int_1^{\infty}\left(\frac{e^{-x}}{1+e^x}\right)dx$
$\frac{sinx}{1-cos^2x}+\frac{1-cos^2x}{\sin x}$
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