$h\left(x\right)=2\ln\left(3x+1\right)$

$\left(3a^2-8b^4\right)^2$

$\left(7x^{3a}+y^a\right)\left(7x^{3a}-y^a\right)$

$\frac{5+2i}{8-2i}$

$\sec\left(x\right)^2-\sec\left(x\right)+\tan\left(x\right)^2=\left(2\sec\left(x\right)+1\right)\left(\sec\left(x\right)-1\right)$

$x^2\le1$

$3\sqrt[3]{3x^2}$