$9z^2-6z+1$
$\int-3\sqrt{5+4x-x^2}dx$
$49m^4+140m^2+100$
$\left(-2+\frac{6i}{n}\right)^2$
$\frac{\left(9x^3-15x^2+27x\right)}{3x}$
$2y-x\frac{dy}{dx}=0$
$2x^2z^3+3y-5y+4z^3+2x^2z^3$
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