$\left(7r+7\right)\left(7r-7\right)$
$3a.\left(3a\right)^{8x-2.}$
$-11a-2\left(12a\right)\:+2$
$\left|\left(x^2\right)^2\right|^2$
$\lim_{x\to0}\left(\frac{sin\left(x\right)}{x^2+x}\right)$
$4x-3^2$
$2\sin\left(x\right)^2+\sin\left(x\right).\cos\left(x\right)=0$
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