Объяснение:
1) = cos (39+21)=cos 60 = 0,5
2) = cos (126-36)=cos 90= 0
3) =cos (52+38)=cos 90 = 0
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Объяснение:
1) = cos (39+21)=cos 60 = 0,5
2) = cos (126-36)=cos 90= 0
3) =cos (52+38)=cos 90 = 0