Косінус x=4/5 sin x-? x є1 чверть - Znanija.Site

Косінус x=4/5 sin x-? x є1 чверть
- Предмет:
  Алгебра
- Автор:
  alaina9kd6
- 4 года назад

Ответы 1

Cosx = 4/5 x - угол первой четвертиSinx = + - √(1 - Cos²x)Если x - угол первой четверти, тоSinx = √(1 - Cos²x) = √ (1 - (4/5))²= $\sqrt{1 - 16/25}$ = $\sqrt{9/25}$ = 3/5
- Автор:
  peterandolph
- 4 года назад
- 0
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