$5x^3+10x^2-40-20x$
$sec^4+sec^2$
$\left(-8x^2y\right)^2\left(-5ab^2c^3\right)$
$3a^{-5}$
$\lim_{x\to0}\left(\frac{\sin\left(3x\right)}{e^x+1}\right)$
$\frac{dy}{dx}=\left(7x^3+12x^2+5x\right)\left(y-3\right)$
$4b^2-9$
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