Ответ: -63
sin(120° + 2 x 360°) = sin(120°) = √3/2
-42√3 x √3/2 = -21√3√3 = -21 x 3 = -63
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Ответ: -63
sin(120° + 2 x 360°) = sin(120°) = √3/2
-42√3 x √3/2 = -21√3√3 = -21 x 3 = -63