$\frac{dy}{dx}=5\cos\left(x\right)-y\cos\left(x\right)$

$x^2senxdx+xydy=0$

$\frac{2x+4}{x^2+4x+3}$

$\left(-7\right)-\left(+8\right)+\left(-3\right)-\left(-9\right)$

$45-\left(32\right)\:+\:\left(-12\right)\:-\:\left|-7\right|$

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

$5ab^2+3ab+6^2$