$4x^2y^2-12xye$

$\frac{4}{4}\pi3^3$

$\frac{1}{\cos^2\left(x\right)}=\sin^2\left(x\right)\cdot\cos^2\left(x\right)+\cos^4\left(x\right)$

$2x^2\left(9x^2-16\right)$

$\left(5x+7\right)\left(5x+3\right)$

$-2\sin\left(x\right)\cdot\cos\left(x\right)$

$\lim_{x\to1}\left(\frac{x^3+1}{\left(x-1\right)^{0.5}}\right)$