$\cos\left(b\right)=\frac{-\sqrt{3}}{2}\:$
$5x+4=4$
$373,744-6,58$
$\frac{tga+tgb}{cotga}$
$m^2+1x^2+49$
$-1\frac{2}{3}x\:4\frac{3}{4}$
$\left(3a^3-7xy^4\right)^4$
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