$\frac{x^2-2x-3}{ax+a}$

$a^2b^2+a^2b+ab^2ab$

$\frac{11}{12}\cdot24$

$31x^2-12x+36$

$\cos\left(\frac{7\pi}{18}\right)\cos\left(\frac{2\pi}{9}\right)+\sin\left(\frac{7\pi}{18}\right)\sin\left(\frac{2\pi}{9}\right)$

$6-\left(-9\right)+20+\left(-35\right)$

$\frac{dy}{dx}\ln\left(y\right)=ye^x$