$\left(x^2+12\right)\left(x^23\right)$

$a^2+2ab$

$19\cdot1\cdot1$

$\frac{1}{1+3\sin\left(x\right)-4\sin^2\left(x\right)}=\frac{1+\sin\left(x\right)}{1+4\sin\left(x\right)}$

$\frac{d}{dx}\left(\frac{4x+8}{7x+12}\right)$

$2x^2-4x\left(6x-7\right)$

$\sqrt{32}+\sqrt{8}$