$\frac{x^2+3x}{x^2+3}$
$\frac{x^2-6x+9}{x-3}$
$x^2\:+\:2x\left(x+y\right)+\left(x+y\right)$
$\log\left(c\right)+n\log\left(a\right)$
$\left(3x^5\right)^6$
$\sec^230-\tan^245$
$\int_{0}^{\infty}x\cos xdx$
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