$\frac{d}{dx}\left(\ln\left(x^2\right)-\arctan\left(\frac{x}{4}\right)\right)$

$\frac{1+\cos\left(x\right)}{\sin\left(x\right)}+\frac{\sin\left(x\right)}{\cos\left(x\right)}=\tan\left(x\right)$

$x=2y-4$

$\left(5x-\frac{1}{10}\right)^2$

$\left(-10-2\right)\cdot\left(-14+4\right)$

$\left(2x+1\right)\left(x-2\right)\left(x+3\right)$

$\lim_{x\to0}\left(4x^2e^x\right)$