3sin^2x-2sinx+2=0

3sin^2x-sin2x+2=0

am nevoie urgent dau coroana

3sin²x-2sinx+2=0

Замена

sinx = a

3a²-2a+2=0

D = 4 - 4*3*2 = - 20

x ∉ R

3sin²x - sin2x + 2 = 0

3sin²x - 2sinxcosx + 2sin²x + cos²x = 0

5sin²x - 2sinxcosx + cos²x = 0

5tg²x - 2tgx + 1 = 0

Замена

tgx = a

5a² - 2a + 1 = 0

D = 4 - 4*5*1 = - 16

x∉R