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

$\lim_{x\to b}\left(\frac{b^5-x^5}{b-x}\right)$

$\frac{\left(\left(\sin\left(x\right)+1\right)-2\cos^2\left(x\right)\right)}{\cos\left(x\right)}$

$\int_0^{2\cdot\pi}\left(\frac{\sin\left(x\right)}{2\cdot\pi}\right)dx$

$\frac{1}{\cos\left(-x\right)}$

$\int\left(2\pi x\sqrt{1-x^2}\right)dx$

$x^2+7x-12\:\left(x+2\right)$