Найти скалярное произведение \small{(9\bar{a}+4\bar{b})\cdot(2\bar{a}-8\bar{...
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Найти скалярное произведение \small{(9\bar{a}+4\bar{b})\cdot(2\bar{a}-8\bar{b}),} если известно, что
\small{|\bar{a}| = 3,\: |\bar{b}| = 2,} угол между векторами
\small{\bar{a}} и
\small{\bar{b}} равен 60°.
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