$\frac{dy}{dx}=\frac{xy+3x-y-3}{4}$

$\int_i^{\infty}\left(2\pi\left(2\pi-x\right)\sin\left(x\right)\right)dx$

$\sin\left(x\right)\cdot\sin\left(x\right)\cdot\cos\left(x\right)\cdot\cos\left(x\right)$

$4x^3+12x^2y+9xy^2+9y^3+4x^2y+12xy^2$

$-4.5+\left(-5.5\right)+\left(3.1\right)$

$2x\cdot3ax$

$-\left(\frac{3}{2}\cdot\:\frac{4}{3}\right)\frac{3}{4}\left(\frac{16}{3}:2\right)$