$x\left(3-x\right)y\left(x-3\right)$
$\frac{dy}{dx}\tan\left(x+y-a\right)$
$\left(7c-h\right)^2$
$\left(-9\right)\left(-5\right)\left(-2\right)$
$3x+12x^2+27x^3$
$2a^2-4ab+2b^2$
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