menalous2006
28-04-2007, 09:59 AM
احسب التكامل الاتىhttp://www.mathyards.com/attach/upload2/wh_45895996.JPG
بسم الله الرحمن الرحيم
السلام عليكم ورحمة الله وبركاته
let y = x^(1/2)
y^2 = x than 2y dy = dx
I = 2 Int (y*(1+y)^1/2 )dy
let w= 1+y than y= w-1 and dy =dw
I = 2Int((w-1)*w^1/2) = 2Int(w^3/2 - w^1/2) = 2[2/5 w^5/2 -2/3 w^3\2] +c
I= 4/5 (1+x^1\2)^5/2 -4/3(1+x^1/2)^3/2 + c