y=1-cos(x) xâ[-Ï,Ï]
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y'=sin(x)
xâ[-Ï,0) y'=sinxâ¤0 yåè°éå
xâ(0,Ï] y'=sinxâ¥0 yåè°éå¢
â´x=0æ¯æå°å¼ç¹ æå°å¼=1-cos(0)=0
x=±Ïæ¯æ大å¼ç¹ æ大å¼=1-cos(±Ï)=2
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y=1-cosx æ¯y=cosx沿x轴翻转åååä¸å¹³ç§»ä¸ä¸ªåä½å¾æ¥ç
y=cosx åè°éå¢åºé´ï¼xâ[-Ï,0) åè°éååºé´ï¼xâ(0,Ï]
翻转å,å¢ååºé´ç¿»è½¬ï¼
åè°éååºé´ï¼xâ[-Ï,0) åè°éå¢åºé´ï¼xâ(0,Ï]
â´x=0 yåå¾æå°å¼=-1
x=±Ïæ¯åå¾æ大å¼=1
沿yè½´ååä¸å¹³ç§»ä¸ä¸ªåä½åï¼æå°å¼=-1+1=0 æ大å¼=1+1=2
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