$\left(4a-3\right)\cdot\left(2a+1\right)$

$\int_0^2\left(\frac{1}{\left(39+18\cdot cos\left(x\right)\right)}\right)dx$

$\left(b+2\right)^1$

$\lim_{x\to2}\frac{x^2\frac{2}{3}}{x-\sqrt{2x}}$

$\left(3x^5+4\right)\left(3x^5-4\right)$

$7\sqrt[4]{7}^{-5}$

$\lim_{x\to0}\left(\frac{\tan\left(e^x-1\right)-e^x+1}{\left(e^x-1\right)^3}\right)$