$\left(3x^5+3x^3-3\right).\left(3x+1\right)$

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

$-\frac{2}{3}-\frac{4}{3}$

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

$7-x\ge5$

$\int\left(\frac{1}{x\sqrt{81+x^2}}\right)dx$

$36m^2+10m+m^3$