$\left(11a-3b\right)\left(11a+3b\right)$
$\csc\left(5x^3+5x\right)$
$\left(3x+2\right)\left(-3x^2-7x+3\right)$
$\sqrt{3-2x}+\sqrt{1-x}-5=0$
$\left(\:8r\:+7e\right).\left(8r-7e\right)$
$13x^6+3z+1y$
$7x-2\left(1-3x\right)\le2x+3$
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