Ответ:
1) cos(225°) = -cos(45°) = -√2/2
2) sin(240°) = -sin(60°) = -√3/2
3) cos (5π/4) = cos(225°) = -√2/2
4) cos (-4π/3) = cos(-240°) = -1/2
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Ответ:
1) cos(225°) = -cos(45°) = -√2/2
2) sin(240°) = -sin(60°) = -√3/2
3) cos (5π/4) = cos(225°) = -√2/2
4) cos (-4π/3) = cos(-240°) = -1/2