Rozwiąż równanie:
2cos( = - 1
cos( = -1/2
= 2/3 + 2k \pi
x/3= 2/3 \pi +2k \pi lub x/3= -2/3 \pi - 2k \pi
x=2 \pi + 6k \pi lub x= -2 \pi - 6k \pi
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2cos( = - 1
cos( = -1/2
= 2/3 + 2k \pi
x/3= 2/3 \pi +2k \pi lub x/3= -2/3 \pi - 2k \pi
x=2 \pi + 6k \pi lub x= -2 \pi - 6k \pi