Ответы на вопрос:
Sin(1650°) = sin( 4*360°+210°) = sin(210°) = sin(180°+30°) = -sin(30°) = = -0,5. cos(-1650°) = cos(1650°) = cos(4*360°+210°) = cos(210°) = = cos(180° + 30°) = - cos(30°) = -(√3)/2
1650/360 = 4, 360*4 = 1440 1650 - 1440 = 210 sin 210 = -1/2 cos -210 = cos 150 = -√3/2
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