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Halimedy
@Halimedy
July 2022
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Пожалуйста, помогите доказать тождество 2) и 4)!!!
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армения20171
8cos10°•cos20°•cos40°=ctg10°
(4•2•sin10°•cos10°•cos20°•cos40°)/sin10°
=(4sin20°•cos20°•cos40°)/sin10°=
(2sin40°•cos40°)/sin10°=sin80°/sin10°
=cos10°/sin10°=ctg10°
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Answers & Comments
(4•2•sin10°•cos10°•cos20°•cos40°)/sin10°
=(4sin20°•cos20°•cos40°)/sin10°=
(2sin40°•cos40°)/sin10°=sin80°/sin10°
=cos10°/sin10°=ctg10°