$\frac{dy}{dx}=\frac{-x+2y}{4x+y}$

$\left(2\cdot x\:+\:y\cdot\:cos\left(x\cdot y\right)\right)dx\:+\:\left(x\cdot cos\left(x\cdot y\right)\right)dy\:=\:0$

$\int_0^b\left(\frac{1}{\sqrt{x^2+b^2}}\right)dx$

$9e^{3}y^{3}\left(3$

$\int\frac{x^2}{\left(x^3+4\right)^{\frac{1}{2}}}dx$

$12cos^2\left(x\right)-5cos\left(x\right)-2=0$

$\frac{x-3}{x+2}<6$