$\left(8mn^2+7u^3\right)\left(8mn^2-7u^3\right)$
$x^2+4x+5=0$
$x2-8x+4$
$\left(\frac{1}{4}x-7\right)\left(\frac{1}{4}x+7\right)$
$y\left(x\right)=-\left(\cos\left(6x\right)+3\sin\left(6x\right)\right)$
$\:8\left(s\:+\:7\right)=72$
$3\cos\left(x+30'\right)=\:2.121$
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