圖片參考：http://hk.knowledge.yahoo.com/math//symbols/integral.gif
1/(1-(1-x)^1/2)dx
2.u=(x+1)/(x-1),find
圖片參考：http://hk.knowledge.yahoo.com/math//symbols/integral.gif
1/((x+1)(x-1))dx
更新1:
answers:1.2(1-x)^1/2+2ln(1-x)^1/2-1)+C 2.1/2ln((x-1)/(x+1))+C
更新2:
u^2=1-x then2u=-x why is 2udu=-dx
更新3:
u^2=1-x then2u=-1才對 why is 2udu=-dx second last ln(u)=ln((x+1)/(x-1)) why is ln((x-1)/(x+1))
