$2x^2-6x+3\ge0$
$-\left(5+\left(-12\right)\right)+\left(5-9+\left(-1\right)\right)$
$2\cos\left(2x\right)=2\sin\left(2x\right)$
$5\cdot5\cdot5$
$x^2-8x+24$
$3x+xy$
$-15y^4=\left(d\right)\left(3y^2\right)$
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