$\left(3x+12\right)\left(3x\right)$
$\sqrt{a^2-a^2b-a^2b+b^2}+b$
$\frac{dy}{dx}=\frac{x^8y}{\left(x^9+9\right)^2}$
$y=e^{x^2}\sqrt[3]{8+x^3}$
$u^2-2u-1$
$2\sin^2\:x-1=0$
$\frac{d^2y}{dx^2}\:y=\frac{a+bx}{a-bx}$
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