ã解æã第ä¸å°é¢èå¯ä¸è§å½æ°å¯¹ç§°è½´æ§è´¨ï¼ç¬¬äºå°é¢èå¯å¤åä¸è§å½æ°åè°æ§ã
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ï¼1ï¼æx=Ï/81带å
¥è§£æå¼å¾
y= sin[2Ã(Ï/81)+Ï]
âµ-Ï<Ï<0,
â´ -79Ï/81<X=2Ï/81+Ï<2Ï/81
è¦æ»¡è¶³sinXå¨æ¤åºé´å
åå¾æå¼ï¼
å X=-Ï/2ï¼
æ¤æ¶Ï=(-Ï/2) -(2Ï/81)=-85Ï/162
(2)âµy=sinxéå¢åºé´æ¯[2kÏ-Ï/2 , 2kÏ+ Ï/2]
â´2kÏ- Ï/2â¤2x -85Ï/162â¤2kÏ+ Ï/2
å³ kÏ +Ï/81â¤xâ¤kÏ + 83Ï/162
â´f(x)=sin(2x+ Ï)éå¢åºé´æ¯[kÏ +Ï/81ï¼kÏ + 83Ï/162]
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