$\left(x+y+z\right)-\left(2x+3y-4z\right)+\left(-4x+5y-z\right)$
$2-1^2-3-1+4$
$tanx+2sin^2x=tanx$
$\left(\:x\:+\:10\right)\left(x\:-\:7\right)$
$\frac{-3x^2+15x}{2x+5}$
$x^2+14x+56$
$\frac{cos\left(-2\right)-cos\left(8x\right)}{2}$
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