$6x^4-8x^35^2$
$\frac{4.2}{2.8}$
$\left(-2\right)\left(10\right)\left(-21\right)$
$\frac{2x^4}{-3xy^2}$
$2x-2\sqrt{3x^2}+2$
$\frac{1}{1-\sec\left(a\right)}+\frac{1}{1+\sec\left(a\right)}=2\cot^2\left(a\right)$
$2\left(-3.5\right)$
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