$\left(-\frac{3}{4}\right)\cdot\frac{1}{2}\cdot\left(-\frac{5}{3}\right)\cdot\frac{8}{5}$

$15x^5-102x^4-21x^3$

$\lim\:_{x\to\:6}\left(\frac{x^2-36}{x-6}\right)$

$8\left(-5d-9\right)-3\left(-6d+10\right)$

$9x^2+72xy+54y^2$

$\tan\left(w\right)\left(1-\sin^2\left(w\right)\right)$

$\frac{-21a^5b^6}{7a^4b^2}$