$\left(x^2-1\right)\left(x^4+x^2+1\right)$
$\:43.89-3.74$
$\lim_{x\to0}\left(tan\left(8x\right)\right)^x$
$16xy-12xy+4xy-3xy$
$3x+4x^2-8x+3x^2-\left(5x^2-9x\right)+\left(2x-x^2\right)$
$a^2b^2c^2-9$
$\left(-68\right)-\left(-4\right)+\left(-73\right)-\left(52\right)+\left(+106\right)$
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