$\lim_{x\to\:3}\frac{x^3-9x}{x^2-3x}$
$\frac{x^3+x^2+x+1}{x+1}$
$\left(-3xy\right)^2\cdot\left(-5xy\right)$
$\left(3m+2-7x\right)^2$
$-2\left(16a^4b^2c^6\right)$
$\int\sin\left(15x\right)dx$
$x^5\:x\:y^5$
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