$\int x^5cos\left(x^3\right)dx$

$\sec\left(x\right)+\cos\left(x\right)^2=\frac{1}{\cos\left(x\right)}+\frac{1}{\sec\left(x\right)^2}$

$6-4r+r^2=\:5$

$10-4:\:4\:+3\:.\:\left(7-2\right)$

$\frac{d}{dx}\left(y\sqrt{x+y}=1\right)$

$\left(\frac{2}{3}xy^5+\frac{5}{2}x^3y\right)^2$

$\lim_{h\to0}\left(\frac{\left(-3+h\right)^{2}-9}{h}\right)$