$\frac{15\:x^9}{5\:x^{15}}$
$\lim_{x\to4}\left(\frac{x^2-16}{1-\sqrt[4]{x-3}}\right)$
$y^2-42y+441$
$\int_{-\infty}^{-2}\left(\frac{1}{x+2}\right)dx$
$\frac{\cos^2x+\tan^2x}{sin^2\:x}$
$\left(\left(-2\right)\cdot\left(3\right)\right)^2$
$\left(2d+3\right)\left(3d+4\right)$
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