cos(180-a)=-cosa
所以cos179=cos(180-1)=-cos1
同理,cos178=-cos2
……
所以原式=(cos1-cos1)+(cos2-cos2)+……+(cos89-cos89)+cos90
=0
求cos1º+cos2º+cos3º+……+cos178º+cos179º的值
求cos1º+cos2º+cos3º+……+cos178º+cos179º的值
數(shù)學人氣：698 ℃時間：2020-02-02 20:58:36
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