$v+4+6v-6$
$\left(8x\:-\:5\right)\left(x\:2+\:6x\right)-\:\left(9x\:+\:2\right)\left(4x\:2-\:3x\right)$
$\left(6x^3-4\right)\left(x^3-4\right)$
$z=x^2-2xy$
$36+\left[\left(4\cdot5\right)+\frac{8}{4}\left(+9-12\right)\right]$
$\frac{1+sin\left(x\right)}{\cos\left(x\right)}=\frac{\cos\left(x\right)}{1-\sin\left(x\right)}$
$r^2-20r-21=5$
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