Объяснение:
sin30°=-cos120°
sin30°=1/2
-cos120°=-cos(180°-60°)=-(-cos60°)=cos60°=1/2
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Объяснение:
sin30°=-cos120°
sin30°=1/2
-cos120°=-cos(180°-60°)=-(-cos60°)=cos60°=1/2