$z=\sqrt{1+xy}$

$36x^2+132x-121$

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

$2+4\ln\left(x\right)^2=0$

$\lim_{x\to\infty}\left(\left(x^2-\sqrt{x^4-x^2}\right)\right)$

$\left(\frac{4}{7}a+\frac{7}{4}b\right)^2-\left(\frac{4}{7}a-\frac{7}{4}b\right)^2$

$\frac{d}{dx}\frac{1}{2}\left(\csc\left(x^2\right)\right)$