$\left(2x^3-x\right)^2$
$2x^2+y^2;\:x=7;\:y=10$
$\lim_{x\to-\pi}\left(\frac{9\cos\left(x+9\right)}{\left(x+\pi\right)^2}\right)$
$\frac{x^3+7x^2+14x+8}{x^2+5x+4}$
$\frac{4e^{-2\infty}}{e^{-2\infty}+3}$
$\sin^52x\cos^2\left(2x\right)$
$\sec\:^2\left(\arctan\:\left(\frac{\sqrt{b^2-a^2}}{a}\right)\right)$
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