2Cos²x - Cosx - 3 = 0
Сделаем замену :
Cosx = m, - 1 ≤ m ≤ 1
2m² - m - 3 = 0
D = (- 1)² - 4 * 2 * (- 3) = 1 + 24 = 25 = 5²
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2Cos²x - Cosx - 3 = 0
Сделаем замену :
Cosx = m, - 1 ≤ m ≤ 1
2m² - m - 3 = 0
D = (- 1)² - 4 * 2 * (- 3) = 1 + 24 = 25 = 5²