3sin^2x-2sinx+2=0
3sin^2x-sin2x+2=0
am nevoie urgent dau coroana

3sin²x-2sinx+2=0Заменаsinx = a3a²-2a+2=0D = 4 - 4*3*2 = -20 x ∉ R3sin²x - sin2x + 2  = 03sin²x - 2sinxcosx +2sin²x + cos²x = 05sin²x - 2sinxcosx +cos²x = 05tg²x - 2tgx + 1 = 0Заменаtgx = a5a² - 2a + 1 = 0D = 4 - 4*5*1 = -16 x∉R