найдите 169 sin2a, если sin=5/13, п/2<a<п - Знания.site

найдите 169 sin2a, если sin=5/13, п/2<a<п
- Предмет:
  Алгебра
- Автор:
  banks
- 5 лет назад

Ответы 1

|cosa| =sqrt(1-25/169)=12/13cosa=-12/13sin2a=2sinacosa=2*5/13*(-12/13)=-120/169169*(-120\169)=-120
- Автор:
  zaniyahtpy3
- 1 год назад
- 5
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