$\left(1.5+3.2u\right)\left(2.5+3.2u\right)$

$x^26x-1$

$\frac{\left(5x^2-\frac{13}{18}xy-\frac{2}{3}y^2\right)}{\left(3x-\frac{4}{3}y\right)}$

$4^{-2}\cdot4^4$

$\frac{1+\cos\left(x\right)}{1-\cos\left(x\right)}=\left(\cot\left(x\right)+\csc\left(x\right)\right)^2$

$-k-\left(-8k\right)$

$m^{2}mo^{6}-n^{3}m^{3}0+n^{2}m^{2}n^{2}$