$dy=\left(x^2+x^2y^2\right)dx$
$\lim_{x\to0}x^2\left(e^{-x^{-2}}-1\right)$
$5\cdot7-12-6-5\cdot4-4$
$\lim_{x\to\infty}\:\frac{9x^3-2x+1}{x^2-4x+2}$
$\frac{df}{dx}=\frac{8}{x^5}+5.3^x+5\cos\left(x\right)$
$\left(n+5\right)^3$
$\frac{d}{dx}2x^3-5xy-y^2=\frac{d}{dx}3$
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