$xy'=45y$
$\frac{dy}{dt}=\:-2t\left(y^2-3y+2\right)$
$x^2-10x+25=1$
$9a^2+30a-25$
$\lim_{x\to0}\frac{\sin\left(5x\right)\sin\left(3x\right)}{x^2}$
$\left(\frac{2}{5}y^3z^3-\frac{1}{3}yz^2\right)^3$
$\left(x-y\right)+\left(2x-z+3y\right)+\left(5y-4x\right)$
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