$-\left|-2+\left(-4\right)\right|\cdot\left(-9\right)$
$y'=2sec2y$
$\left(+6\right)-\left(-8\right)-\left(-4\right)-\left(-10\right)$
$\left(3m+2n+x\right)^2$
$\left(10x-7\right)\left(10x+7\right)$
$\sin\left(2x\right)\left(1-2\cos\left(2x\right)\right)=0$
$4y^2-3y^3-7y^2+5y^3$
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