$3x^2+6x^2+10^2$

$\left(6t\right)^2+\left(6t^2\right)^2$

$\left(6+2f\right)^2$

$^{\left(1+x\right)}^2$

$\lim_{x\to0}\left(\frac{2-2cos\left(3x\right)+12xsen\left(3x\right)+9x^2cos\left(3x\right)}{12x^2}\right)$

$\left(\frac{\sqrt{1-2x^2}\left(x+3\right)}{\left(4x-1\right)^2}\right)$

$8^3x\:8$