有數唔識時(a.maths)

Yumi Tse

2008-02-19 6:45 am

cos(-290)

回答 (2)

Lok Ting

2008-02-20 3:17 am

✔ 最佳答案

cos(-290)
=cos(290)
= cos(360 - 290)
= cos 70

👍 0 👎 0

[匿名]

2008-02-19 7:42 am

cos(-290)
= cos(360 - 290)
= cos 70

👍 0 👎 0

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