$2x^4-4x^3-4x^2+6$
$2x+y;\:x=7;\:y=10by$
$-\frac{32x^2}{8x}$
$\int\:sec\left(9-x\right)tan\left(9-x\right)dx$
$20+90+51\infty e\infty$
$\frac{x^2-3x-7}{x-5}$
$\int\frac{\left(\sqrt{x}+2\right)^7}{\sqrt{x}}dx$
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