不定积分 ∫dx/［（x-a）（x-b）］^½ 其中a＜b是常数

√(b - x) = √[b - a - (x - a)] = √[b - a - √(x - a)²]
1/√(x - a) dx = 2 · 1/[2√(x - a)] d(x - a) = 2 d√(x - a)
我的做法：
∫ dx/√[(x - a)(x - b)] = ∫ dx/√[x² - (a + b)x + ab]
= ∫ dx/√[(x - (a + b)/2)² - ((a + b)/2)² + ab]
= ∫ dx/√[(x - (a + b)/2)² - ((a - b)/2)²]
= ln|(a - b)/2 + √[(x - (a + b)/2)² - ((a - b)/2)²]| + C