$2sin\left(x+\frac{\pi\:}{2}\right)-cos\left(x\right)-1$
$\frac{5x^2}{\sqrt{10x}+\sqrt{5x}}$
$\frac{-9x-3}{-3}$
$x^2y+y$
$x^2+4x-6=0$
$12x^2y^3x$
$\left(2x+7\right)\cdot\left(2x-8\right)$
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