$\frac{x^3-5x^2+5x-2}{x+3}$

$\frac{x-x^2}{1+bx^2}$

$xy-2xy+3x^2y-4xy^2+2xy^2$

$\tan^2\left(x\right)\csc=\sin\left(x\right)\cos\left(x\right)^2$

$\frac{z^{18}-m^{12}}{z^3+m^2}$

$\frac{sin\left(x\right)-cos\left(x\right)}{sin\left(x\right)}=\frac{cos\left(x\right)-sin\left(x\right)}{cos\left(x\right)}$

$\left(-3.1x+15.5\right)^2$