三角學(一D都唔明)

2009-08-03 6:31 am

1.(tan²30∙sin²45)/(cos^²60 )

2.sin²45-cos²45+sin30X
cos60+tan60
呢D數點計數植架?我一D都唔明,麻煩各位解釋下,THX!!

回答 (4)

2009-08-03 6:54 am

✔ 最佳答案

As follows:

圖片參考：http://a.imagehost.org/0806/ScreenHunter_01_Aug_02_22_51.gif

2009-08-02 22:54:22 補充：
第2題唔可再打清楚d題目?!

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2009-08-03 5:19 pm

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2009-08-03 2:54 pm

To do this type of questions, you have to MEMORIZE the sin, cos and tan of the three special angles : 30, 45 and 60.

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2009-08-03 8:06 am

I think he means:
sin²45-cos²45+sin30 * cos60 + tan60,
where " * " means "times"

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