$m\left(x+1\right)^2+\left(x+1\right)-y\left(x+1\right)$
$-9n^2+3x^2+m-x+11n^2-m$
$-cos\left(x\right)+1=2cos\left(x\right)+3$
$-19\:+\:-320$
$4\cos\left(-x\right)\cdot\cos\left(90+x\right)$
$\left(a+6\right)\left(4a-3\right)$
$5x^2-50x+30=0$
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