余弦﹣1920度等于多少
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余弦﹣1920度等于多少
余弦﹣1920度等于多少
余弦﹣1920度等于多少
-1/2
cos(-1920°)=cos(-360*5-120°)=cos(-120°)=cos(120°)=-1/2
cos(-1920°)
=cos(-120°)
=cos120°
=-cos60°
=-1/2
余弦﹣1920度等于多少
余弦﹣1920度等于多少
余弦﹣1920度等于多少
-1/2
cos(-1920°)=cos(-360*5-120°)=cos(-120°)=cos(120°)=-1/2
cos(-1920°)
=cos(-120°)
=cos120°
=-cos60°
=-1/2