ÌâÄ¿ÄÚÈÝ

7£®Ò»ÒÑÖªº¯Êýf£¨x£©=cos£¨¦Øx+¦Õ-$\frac{¦Ð}{2}$£©£¨¦Ø£¾0£¬|¦Õ|£¼$\frac{¦Ð}{2}$£©µÄ²¿·ÖͼÏóÈçͼËùʾ£¬Ôòy=f£¨x+$\frac{¦Ð}{6}$£©È¡µÃ×îСֵʱxµÄ¼¯ºÏΪ£¨¡¡¡¡£©
A£®{x|x=k¦Ð-$\frac{¦Ð}{6}$£¬k¡Êz}B£®{x|x=k¦Ð-$\frac{¦Ð}{3}$£¬k¡Êz}C£®{x|x=2k¦Ð-$\frac{¦Ð}{6}$£¬k¡Êz}}D£®{x|x=2k¦Ð-$\frac{¦Ð}{3}$£¬k¡Êz}}

·ÖÎö ¸ù¾ÝͼÏóÇó³öº¯ÊýµÄ½âÎöʽ£¬½áºÏÈý½Çº¯ÊýµÄÐÔÖʼ´¿ÉµÃµ½½áÂÛ£®

½â´ð ½â£ºf£¨x£©=cos£¨¦Øx+¦Õ-$\frac{¦Ð}{2}$£©=sin£¨¦Øx+¦Õ£©£¬
Ôò$\frac{T}{4}=\frac{7¦Ð}{12}-\frac{¦Ð}{3}=\frac{¦Ð}{4}$£¬¼´º¯Êýf£¨x£©µÄÖÜÆÚT=¦Ð£¬
¼´T=$\frac{2¦Ð}{¦Ø}$=¦Ð£¬
¡à¦Ø=2£¬¼´f£¨x£©=sin£¨2x+¦Õ£©£¬
ÓÉÎåµã¶ÔÓ¦·¨µÃ2¡Á$\frac{¦Ð}{3}$+¦Õ=$\frac{¦Ð}{2}$£¬
½âµÃ¦Õ=-$\frac{¦Ð}{6}$£¬
¼´f£¨x£©=sin£¨2x-$\frac{¦Ð}{6}$£©£¬
Ôòy=f£¨x+$\frac{¦Ð}{6}$£©=sin[2£¨x+$\frac{¦Ð}{6}$£©-$\frac{¦Ð}{6}$]=sin£¨2x+$\frac{¦Ð}{6}$£©£¬
ÓÉ2x+$\frac{¦Ð}{6}$=-$\frac{¦Ð}{2}$+2k¦Ð£¬
½âµÃx=k¦Ð-$\frac{¦Ð}{3}$£¬k¡Êz£¬
¼´y=f£¨x+$\frac{¦Ð}{6}$£©È¡µÃ×îСֵʱxµÄ¼¯ºÏΪ{x|x=k¦Ð-$\frac{¦Ð}{3}$£¬k¡Êz}£¬
¹ÊÑ¡£ºB£®

µãÆÀ ±¾ÌâÖ÷Òª¿¼²éÈý½Çº¯Êý×îÖµµÄÇó½â£¬ÀûÓÃͼÏóÇó³öÈý½Çº¯ÊýµÄ½âÎöʽÊǽâ¾ö±¾ÌâµÄ¹Ø¼ü£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø