Ответы на вопрос:
3cos2x - 14 cosx + 7 = 0 3 cos2x - 14 cosx = -7 cos(x)(3cos(2)-14)=-7 -11.001827cos(x)=-7 cos(x)=-7/-11.001827 cos(x)=0.636258 x=50.489
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