$\left(3x+9\right)\left(3x-9\right)$
$y'\:=\left(\:x^2+x-2\right)\left(y^2-y+1\right)$
$25n^2+140n+196$
$0,24\cdot0,2$
$6\left(x-2\right)\ge-8x$
$\frac{d}{dy}3x^2z+2z^3-3yz=0$
$\frac{\cos\:\left(-4y+3x\right)+\cos\:\left(x-2y\right)}{2}$
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