$24a^2xy^3-36x^2y^4$

$\left(z^{x+1}-3\right)\left(z^{x+1}-7\right)$

$2-31+17-21+89-39-7+3$

$\frac{2\sin\left(2a\right)-\sin\left(4a\right)+\sin\left(8a\right)}{\sin\left(5a\right)-\sin\left(a\right)}$

$z^{-4}\cdot\left(z^2\right)^5$

$\frac{x^{\frac{2}{3}}-x}{x\sqrt[3]{x}+x\sqrt{x}-\sqrt[3]{x}-\sqrt{x}}$

$a2-2ab;\:a=2;\:b=1$