$\frac{x^2-1}{3x+9}\cdot\frac{xy+3y}{x^2y-y}$

$-2e^2.2e^2.2e^2.2e^2$

$\sqrt[6]{5x}\sqrt[3]{x^2}$

$x^{3}y^{6}-64y^{9}$

$\frac{2}{3}a^3-\frac{2}{4}a^2b+\frac{4}{5}b^2+\frac{3}{2}a^3-\frac{5}{6}b^2+\frac{5}{4}a^2b$

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

$2x\left(x^2-4x+3\right)$