2Cos²x - 1 = Sinx
2(1 - Sin²x) - 1 - Sinx = 0
2 - 2Sin²x - 1 - Sinx = 0
2Sin²x + Sinx - 1 = 0
Сделаем замену :
Sinx = m , m ∈ [- 1 , 1]
2m² + m - 1 = 0
D = 1² - 4 * 2 * (- 1) = 1 + 8 = 9 = 3²
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2Cos²x - 1 = Sinx
2(1 - Sin²x) - 1 - Sinx = 0
2 - 2Sin²x - 1 - Sinx = 0
2Sin²x + Sinx - 1 = 0
Сделаем замену :
Sinx = m , m ∈ [- 1 , 1]
2m² + m - 1 = 0
D = 1² - 4 * 2 * (- 1) = 1 + 8 = 9 = 3²