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

$\frac{2dv}{dt}+v=10$

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

$\int_{\tan\left(x\right)}^{\sec\left(x\right)}\left(2x\cos\left(y\right)\right)dx$

$\frac{mn}{z};\:m=-2;\:n=3\:;\:z=\frac{1}{2}\:$

$8\cdot5+2\cdot9$

$-\frac{8}{11}b+\frac{2}{5}b$