$-3^4-3\left(-3\right)^3+5\left(-3\right)^2-9\left(-3\right)+6$

$\tan\left(x\right)\left(\cot\left(x\right)+\sec\left(x\right)\right)$

$\frac{10b}{-30ab}$

$\frac{36x^2y-6}{72x^{-1}y^{-5}}\left(-3\right)$

$\left(a-2\right)\left(b-1\right)$

$4a^2+4ab^2+b^4-1$

$3d^{-4}\cdot3d^5$