$4ydx=x\left(y-3\right)dy$

$-\left(-3.003\right)+\left(-3-3303\right)$

$\int\left(x^3cos\right)\left(x^4+2\right)dx$

$-\left(-3^3\right)$

$\left(\frac{1}{4}x+\frac{3}{5}\right)\left(\frac{2}{5}x\frac{3}{4}\right)$

$\lim_{x\to5}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$

$\int\frac{4y}{1+y^2}dy$