$\int10sin\left(x\right)sin\left(2x\right)sin\left(3x\right)dx$
$\lim_{x\to2}\left(\frac{x^2-1x+2}{x^2-4}\right)$
$-2cos^2x+cosx+1=0$
$-\frac{2}{2}+6-1$
$4x+5<2x-1$
$10\sqrt{7}+8\sqrt{7}$
$u+-3=-7.9$
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