Ответ:
-24/25
Объяснение:
sinα= -0.28; α∈(π; 3π/2) III координат. оси
cos²α+sin²α=1
cos²α=1-sin²α=1-(-0.28)²=1-(28/100)²=1-(7/25)²=1-49/625=576/625
cos²α=576/625
cosα=±24/25
α∈(π; 3π/2)
cosα= -24/25
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Ответ:
-24/25
Объяснение:
sinα= -0.28; α∈(π; 3π/2) III координат. оси
cos²α+sin²α=1
cos²α=1-sin²α=1-(-0.28)²=1-(28/100)²=1-(7/25)²=1-49/625=576/625
cos²α=576/625
cosα=±24/25
α∈(π; 3π/2)
cosα= -24/25