4Cos²x - 11Sinx - 1 = 0
4 * (1 - Sin²x) - 11Sinx - 1 = 0
4 - 4Sin²x - 11Sinx - 1 = 0
- 4Sin²x - 11Sinx + 3 = 0
4Sin²x + 11Sinx - 3 = 0
D = 11² - 4 * 4 * (- 3) = 121 + 48 = 169 = 13²
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4Cos²x - 11Sinx - 1 = 0
4 * (1 - Sin²x) - 11Sinx - 1 = 0
4 - 4Sin²x - 11Sinx - 1 = 0
- 4Sin²x - 11Sinx + 3 = 0
4Sin²x + 11Sinx - 3 = 0
D = 11² - 4 * 4 * (- 3) = 121 + 48 = 169 = 13²