A.Maths問題一問~~~微積分的

2007-10-11 3:41 am
我做HW既時候...
有條問題搞嚟搞去都揾唔到Ans....
條問題係:
微積分(個Symbol唔識打)SinxCos^2x dx
之後睇Solution見到:
SinxCos^2x dx
=cox^2x d(cosx)
唔知點解個DX變咗做D(cosx)......
求解.......

回答 (2)

2007-10-11 4:03 am
✔ 最佳答案
As follows~~~


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2007-10-10 20:03:18 補充:
variables~~~ 唔係vairables
參考: Myself~~~
2007-10-11 3:49 am
因為 d(cos)/dx = -sinx
利用differntial的概念, 得出d(cos x) = - sinx dx


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