$\lim_{x\to1}\left(\frac{4x-1}{2x^2-3x+4}\right)$
$\left(-10x^2+9x\right)-\left(-6x+4\right)$
$\frac{\left(x+8\right)}{2x^2-13x-7}$
$\left|84\cdot\left(-1\right)\right|+71$
$\left(2a+36\right)\left(2a-36\right)$
$\left(\frac{4}{3}a+\frac{2}{3}b\right)\left(\frac{4}{3}a-\frac{2}{3}b\right)$
$\frac{dy}{dx}=5xcos^2y$
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