$b^3\:;\:b=2$

$\frac{2x^3-6x^2+x-1^{-1}}{2x^2+1}$

$\frac{x-1}{-3}+\frac{1}{5}\le\frac{x}{2}-3$

$\left(-24x^2+120x-150\right)\cdot\left(\frac{1}{4}x^2-\frac{5}{4}x+\frac{25}{16}\right)$

$\int\frac{\ln\left(x\right)}{x^{12}}dx$

$\sin\left(a\right)-\frac{\tan\left(a\right)}{\sec\left(a\right)}$

$6x^{-1}$