$y'+2+2x=0$
$\left(-3\right)\left(3+5\right)-4\left(-9-5\right)$
$\int\frac{3x^2}{\left(x^3+1\right)^2}dx$
$\int-2x^3e^{4x}dx$
$4\left(0.4x-1mn\right)$
$\lim_{x\to\infty}\frac{x^3+6x^2+12x+8}{x^2+8x+6}$
$\frac{3^3+x-11}{x+1}$
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