$\left(\frac{2b^4}{b^3}\right)^3$

$\frac{\sec^2\left(x\right)\tan\left(x\right)}{\cot\left(x\right)\csc^2\left(x\right)}$

$\lim_{x\to2}\left(\frac{\sqrt{1-4x}-3}{1+\sqrt[3]{2x+3}}\right)$

$-v^2-v-1$

$\int\left(\frac{\left(x^2+4x\right)}{x^2+1}\right)dx$

$\frac{3x^2+25x+30}{3x+4}$