ming asked in 科學及數學數學 · 5 years ago

數學不懂做14

1.求tan(x/2)-1/tan(x/2)的最小正周期.

2.|sin(π/6-x)+sinx|的最小正周期.

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  • 5 years ago
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    Please read:

    圖片參考:https://s.yimg.com/rk/HA00430218/o/1914749164.png

    2014-09-19 11:26:41 補充:

    回答 少年時 老師:

    有關最小正周期(minimal positive period)可看:

    http://baike.baidu.com/view/1044776.htm

    2014-09-21 15:57:30 補充:

    對,用 sum to product 也可。

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  • |sin(π/6-x)+sinx|

    =| 2 sin[(π/6-x+x)/2] cos [(π/6-x-x)/2] |

    =| 2 sin(π/12) cos (π/12 -x) |

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  • 5 years ago

    請問 "周期" 與 "正周期" 有何公別?

    2014-09-19 11:43:31 補充:

    Thank you very much, ���� sir.

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  • 5 years ago

    ASK YOUR TEACHER!!!!!!!!!!!!!

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