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令x = a · sinθ,dx = acosθdθ∫ x²/√(a² - x²) dx = ∫ a²sin²θ/√(a² - a²sin²θ) · acosθ dθ= ∫ a²sin²θ/(acosθ) · acosθ dθ= a² · ∫ (...
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