cos1°=-cos179°
同理,cos2°=-cos178°,cos3°=-cos177°
則cos1°+cos179°=0
原式可簡化為0+cos90°=0
cos1°+cos2°+cos3°+...+cos179°化簡
cos1°+cos2°+cos3°+...+cos179°化簡
數(shù)學(xué)人氣：774 ℃時間：2020-02-02 20:09:37
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