ответ: x=7p/18 +2pn/3; x=-p/6+2pn/3, n E Z
Объяснение:
cos(3x-p/3)= -V3/ 2 (V -корень)
3x-p/3=+-5p/6+2pn, 3x=p/3+5p/6+2pn=7p/6+2pn, x=7p/18+2pn/3,
3x=p/3-5p/6+2pn= -3p/6 +2pn=-p/2+2pn, x=-p/6+2pn/3, n E Z
