∫xdx/√(4-x²) = 1/2 * ∫d(x²)/√(4-x²) = - 1/2 * ∫d(4-x²)/√(4-x²) = [заменим 4-х² на у] = -1/2 * ∫dy/√y = -1/2 * 2 * √y + C = C - √y = C - √(4-x²)
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∫xdx/√(4-x²) = 1/2 * ∫d(x²)/√(4-x²) = - 1/2 * ∫d(4-x²)/√(4-x²) = [заменим 4-х² на у] = -1/2 * ∫dy/√y = -1/2 * 2 * √y + C = C - √y = C - √(4-x²)