$9a^2-27ab+9b^2$
$z=\cos\left(3x+4y\right),x=2t+\frac{\pi}{2},y=-t-\frac{\pi}{4}$
$\sqrt{18x^2y}\cdot\sqrt{2xy^3}$
$e^{-y}sin\left(x\right)-\frac{dy}{dx}\cdot cos^2\left(x\right)=0$
$\left(3x^4-8x^3+8x^2+1\right)\::\:\left(3x^2-2x-1\right)$
$6g-18$
$y'+2xy=2x$
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