Формула косинуса разности
cos(a-b) = sin(a)sin(b) + cos(a)cos(b) -->
cos(x-п/6) = sin(п/6)sin(x) + cos(п/6)cos(x)
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Формула косинуса разности
cos(a-b) = sin(a)sin(b) + cos(a)cos(b) -->
cos(x-п/6) = sin(п/6)sin(x) + cos(п/6)cos(x)
по формуле
cosπ/6*cosx+sinπ/6*sinx=cos(x-π/6)