$\frac{\arctan\left(x\right)}{e^{-1}}$

$\left(4x^2+y^2\right)dx-4xy\cdot dy=0$

$\frac{\left(cos\left(x\right)-sec\left(x\right)\right)}{sin\left(x\right)}$

$\int_0^{\pi}\left(y\cdot\cos\left(4y\right)\right)dy$

$\left(-2+\frac{1}{a}\right)^2$

$\lim_{x\to2}\frac{\left(x-2\right)^2}{x^2-8}$

$\frac{64m^6-1}{2m-m}$