$-6=\frac{n}{2}-10$
$y^3-343$
$\sqrt{\cos\left(x\right)}^2-\left(e^x\right)^2$
$-15.\:8\:-\:\left(\:-128+256\right):\:\left(\:-7+3\right)\:$
$\lim\:_{x\to\:\:0}\left(\frac{2x^4-7x^2-6x}{8x^4+3x}\right)$
$\left(4x^2-12xy+9y^2\right)+\left(25x^2+4xy-32y^2\right)$
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