$-4\:-\:\left(4\:-3\:+\:4\right)\:-\:\left(-9\:-18\:-3\right)$

$\frac{2x+1}{x^2+11x+30}$

$\lim_{x\to0}\left(\frac{\sqrt{\tan\left(x\right)^2}}{\sqrt{\sec\left(x\right)^2}}\right)$

$\frac{dy}{dx}=\frac{20x-3}{10x^2-3x}$

$\frac{dy}{dx}\sqrt{x}-\sqrt{y}=8$

$\int\left(\frac{\sec\left(x\right)^2}{\sqrt[2]{4-\tan\left(x\right)^2}}\right)dx$

$\left(x^2+16\right)>8x$