sin3x - sinx = √3cos2x
2sinxcos2x - √3cos2x = 0
cos2x (2sinx - √3) = 0
2x = p/2 + 2pn
x = p/4 + pn
sinx = √3/2
x = (-1)^n * p/6 + pn
б) 3cos^2x + sin^2x - 2sin2x = 0
3 - 3sin^2x + sin^2x - 2sin2x = 0
-sin^2x - 2sin2x + 3 = 0
sin^2x + 2sinxcosx + 3 = 0
tg^2x + 2tgx + 3 + 3tg^2x = 0
4tg^2x + 2tgx + 3 = 0