$\left(3x^2\:-\:x\:-\:2\right)^3$

$15x^4+22x^3$

$2\cos^2\left(x\right)+\sin^2\left(x\right)-\cos^2\left(x\right)$

$f\left(x\right)=4ex\left[ln\left(1+ex\right)\right]3\left(1+ex\right)$

$y=\frac{\theta^{3}\cos\theta}{\left(\theta+5\right)^{2}}$

$-7^4$

$\sqrt[5]{\frac{x-1}{x+2}}$