Math differential 問題

2012-10-31 9:06 pm
請問,

how to integrat and differential e^(-t^2)

煩請DETAIL 解說, 因為本人MATH底不好
謝謝各位

回答 (3)

2012-11-01 9:20 am
✔ 最佳答案
differentiate e^(-t^2)
d( e^(-t^2) )/dt
= e^(-t^2) * (-2t)
= -2te^(-t^2)

Indefinite Integration
現時數學界相信未有人可以做得到,因為做得到應該就可以攞獎了

Definite integration
是有方法估算的,用M1的方法,與Normal distribution有關。

2012-11-02 01:45:17 補充:
樓下師兄:
忘記了exponential series~~
樓主用樓下的答案吧~~

所謂exponential series,即:
e^x = 1 + x + x^2 /2! + x^3 / 3! + x^4 / 4! + ... = summation(n=0->inf) (x^n / n!)

2012-11-02 01:47:26 補充:
(-2t) 是用 Chain rule
例: y = (2x^3+4)^5
dy/dx = 5(2x^3+4)^4 * (2*3x^2) <--這個

2012-11-02 12:58:27 補充:
http://maeducation.edu.hk/Yahoo/7012103100194.pdf
參考: maeducation.edu.hk, maeducation.edu.hk
2012-11-02 7:47 am
differentiate e^(-t^2)
d( e^(-t^2) )/dt
= e^(-t^2) * (-2t)
= -2te^(-t^2)


請問 = e^(-t^2) * (-2t) =========>(-2t) 係點來的呢

謝謝兩位
2012-11-02 4:45 am

圖片參考:http://i1099.photobucket.com/albums/g395/jasoncube/1-2.png


I HOPE THIS CAN HELP YOU! ~ ^_^

2012-11-01 20:46:11 補充:
RE mLee:
真係咁容易有獎攞就好啦 ~
參考: My Maths World


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