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Garmana
@Garmana
July 2022
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Помогите решить тригонометрическое ур-е. Желательно с объяснением ) [tex]2cos \frac{x}{2} = 1+cosx[/tex]
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ProGroomer
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Garmana
почему квадрат-то? я просто ничего не понимаю
ProGroomer
cos2x=cos^2(x)-sin^2(x)=2cos^2(x)-1
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