$\frac{\frac{d}{dx}e^{-\frac{x}{y}}}{\sqrt{1+\frac{x}{y}}}$
$\frac{4x^3+19x^2+19x-6}{x+2}$
$x^8+18x^4+81$
$\left(2x^2yz^3-3xyz\right)^2$
$\frac{dq}{dt}=21-3q$
$8x^2+20x+8$
$\int\left(\frac{\sqrt{4x^2-2}}{x}\right)dx$
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