$\left(5\right)\cdot\left(a^2-3+b^2\right)$

$\frac{x^5-x^4+x^2-2}{x^2+6}$

$-8\left(m-8\right)>4-6\left(m-6\right)$

$\lim\:_{x\to\:0}\left(\frac{tan\:x}{\sqrt[3]{\left(1-cos\:x\right)^2}\:}\right)$

$\frac{dz}{dx}-x\sqrt{z}=0$

$\frac{1-\cosa}{\sena}+\frac{\sena}{1-\losa}$

$\int_0^1\left(\frac{8}{\left(x^2+1\right)\left(x^2+4\right)}\right)dx$