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Tg α β. Sin( α - β ) формула. Cos (α ± β ) =. Формула sin( α – β )=sin α cos β –cos α sin β. Sin²α - cos²α.
Sin( α - β ) формула. Cos (α ± β ) =. Формула sin( α – β )=sin α cos β –cos α sin β. Sin²α - cos²α.

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