$\cot\left(x\frac{dy}{dx}\right)+y=0$

$\lim_{x\to\infty}\left(\frac{1^x}{2^{x+1}}\right)$

$2\left(25+2a^2\right)\:$

$\sin\left(2x\right)+1=2\sin\left(x\right)\cos\left(x\right)+1$

$15x-2x+23x$

$\left(\frac{1}{5}x+\frac{3}{2}y-2\right)\left(-\frac{1}{2}x-\frac{1}{7}y+6\right)$

$6z^2+z-2$