證明cos(360°-α)=cosα OK?
證明cos(360°-α)=cosα OK?
其他人氣：112 ℃時間：2020-10-02 03:22:39
優(yōu)質(zhì)解答
cos(360-a)=cos-a=-cos[180-(-a)]=-(cos180+a)=-(-cosa)=cosa
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