$\int\frac{3x^2-5x+7}{\left(x-1\right)^2\left(x+3\right)}dx$
$\sqrt{4^2}+\sqrt{x^2}$
$\lim_{x\to0}x^{4x}$
$-5x^2+525x-800$
$\frac{x^2+2x}{3x^2-1}$
$\int z\:\cos^22z\:dz$
$\frac{8x^2+6x-12}{x+4}$
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