$\frac{x^3x\:x^2}{x^3}$
$\sec\left(x\right)+\tan\left(x\right)\csc\left(x\right)=2\sec\left(x\right)$
$\lim_{x\to0}\left(1+\frac{4}{n}\right)^{2n}$
$-18\:x\:-10\:x\:9$
$\lim_{x\to0}\left(\frac{x^2-9}{\sqrt{3}-\sqrt{x}}\right)$
$x^4-x^3-32x^2-12x+144$
$x^2\cos\:^2xsenx$
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