證明sin nx乘sinx=cos(n-1)x-cosx乘cosnx
回答 (2)
2007-11-24 6:56 pm
✔ 最佳答案
As follows~~~圖片參考：http://i182.photobucket.com/albums/x4/A_Hepburn_1990/impact.jpg?t=1195872988
參考: Myself~~~
2007-11-24 3:38 pm
since,sin nx乘sinx+cosnx乘cosx=cos(nx-x)
so,LHS-RHS=0
............LHS=RHS
sin nx乘sinx=cos(n-1)x-cosx乘cosnx
so,LHS-RHS=0
............LHS=RHS
sin nx乘sinx=cos(n-1)x-cosx乘cosnx
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