$\left(6x^3+1\right)\left(1-6x^3\right)$
$\lim_{x\to0}\left(5x^{7x}\right)$
$237-8$
$0=-2x^4+2x^2$
$\left(3-a^2b\right)\left(3+a^2b\right)$
$\frac{\sqrt{t^{2+9}}}{t^2}$
$\left(3x^2y-x^2\right)\cdot\left(3x^2y+x^2\right)$
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