$\frac{x^2+25}{5-x}$

$\:\frac{dx}{dy}+\frac{9}{40}y=-\frac{81}{32}$

$8+\left(-2\right)+3+5\cdot\left(-3\right)+\left(-7\right)$

$y=125\left(0.8^{\left(x+1\right)}\right)$

$\left(-2+\frac{6}{n}\right)^2$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{tanx}{\frac{18}{2x-\pi}}\right)$

$\left(\frac{1}{4\:}x\:+\:y\right)^2$