$\lim\:_{x\to\:\pi\:}\left(\frac{\sin\:\left(2x\right)}{x^2-\pi\:\:x}\right)$

$\int_0^{\frac{1}{2}}\left(\frac{x}{\left(2x+1\right)}\right)dx$

$\frac{d}{dx}3^{x^9}$

$\left(y+5\right)\left(x-4\right)$

$\left(\frac{1}{2}b+\frac{2}{3}\right)\left(\frac{1}{2}b+9\right)$

$\int\frac{2x^2}{\sqrt{1-x^2}}dx$

$x^2-13x+140=0$