PT 2sin6x + cos4x - 6cos²2x + 2sin2x + 1 = 0<=> 2(sin6x + sin2x) + 2cos²2x - 1 - 6cos²2x + 1 = 0<=> 4 sin4x cos2x + 2cos²2x - 6cos²2x = 0<=> 8 sin2x cos²2x - 4 cos²2x = 0<=> cos²2x = 0 8 sin2x - 4 = 0<=> cos2x = 0 sin2x = 1/2
PT 2sin6x + cos4x - 6cos²2x + 2sin2x + 1 = 0<=> 2(sin6x + sin2x) + 2cos²2x - 1 - 6cos²2x + 1 = 0<=> 4 sin4x cos2x + 2cos²2x - 6cos²2x = 0<=> 8 sin2x cos²2x - 4 cos²2x = 0<=> cos²2x = 0 8 sin2x - 4 = 0<=> cos2x = 0 sin2x = 1/2