$\cos^4y-2\cos^2y+1$
$\left(-\frac{7}{6}a^{4x-3}b^{2x}c^4\right)\left(-\frac{3}{14}a^{x+1}bc^x\right)$
$\frac{8-a^3b^3}{2-ab}$
$\frac{-10x^4+5x^3-2x^2}{-5x}$
$\lim_{x\to\infty}\left(\frac{4x^2-3x+7}{x^2\:\log\left(x\right)}\right)$
$x^2-8x-12$
$-13-24-15$
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