$\left(x^2+4xy+5y^2\right)\cdot\left(x-3y\right)$

$\int_{\pi}^{2\pi}\left(\frac{1}{5-3\cos\left(x\right)}\right)dx$

$\frac { x ^ { 4 } } { y ^ { 2 } } - 6$

$3x^2-11x+5$

$\left(\frac{1}{4}x^2y^3-2m^9n^{10}\right)^2$

$\lim_{x\to0}\left(3x\right)^{-\sqrt{x}}$

$x\cdot x\cdot x\cdot x\cdot x$