Integral
本帖最後由 數學小子 於 9-12-2010 23:40 編輯Let f(x)=2x2+5x+3,
find int f-1(x)dx 係咪姐係積一次既意思? 係咪姐係積一次既意思?
p445hkk20001 發表於 10-12-2010 17:26 http://www4.nakuz.com/bbs/images/common/back.gif
根據標題,可能係 佢唔係指-1次,f-1(x)係有一個定義
let x=f(y) => y=f-1(x)
http://upload.wikimedia.org/math/e/8/b/e8b396bf3e1fe2f530679f1eb65292ed.png
http://upload.wikimedia.org/math/8/5/8/858649d76cd414f14190993c57523a28.png
http://upload.wikimedia.org/math/6/e/a/6ea7d4a89450189e14b4ec3f08cbc5f5.png(by quadratic equation)
hence,http://upload.wikimedia.org/math/5/4/4/54424bb98d0079ad0f65be1cec2cfec3.png let x=f(y) => y=f-1(x)
咩名堂?新野? siny=x
y=sin-1x
inverse function 咁f-1(x)dx姐係調轉左既d
即係積佢一野?
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