7cos(arctg √3/3+arcsin(-√3/2) ).. Created by Marina1331. matematika-ru

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7cos(arctg √3/3+arcsin(-√3/2) ).

elena10201 7cos(пи/6-пи/3))=7cos(-пи/6)=7cos(пи/6)=7*r3/2=3.5r3. r- обозначение кв.корня

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