Express each of give quantities in terms of sinx and cosx
1. sin(2π-x)
2. cos(3π/2 +x)
3. (tanx-cotx)/(tanx+cotx)
Let A, B, C be the angles of a triangle with opposite sides a,b,c, respectively.
1. find sin B if a=4,b=3, A= π/4
2. find cos A if a=2, b=2, c=3.
2. find c if a=1, b=√2, A= π/6 (there are two possible answers)
又係數學題喇...唔該曬各位幫手解答下
2009-03-25 3:13 pm
回答 (1)
2009-03-25 7:47 pm
✔ 最佳答案
Express each of give quantities in terms of sinx and cosx1. sin(2π-x)
=-sinx
2. cos(3π/2 +x)
=sinx
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圖片參考：http://f.imagehost.org/0134/ScreenHunter_02_Mar_25_11_43.gif
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