$-1307-209$
$1.23\cdot\:10$
$-\left[-\left(-1\right)+\left(2+-3\right)\right]$
$\frac{2x^4-2x^3+2x^2-2x+1}{x+1}$
$-11+5\left(7\right)$
$\cos a\cdot\cos b+\sin a\cdot\sin b$
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