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	Các bình luận về: 19. Cho tích phân \(\int\limits_0^{\frac{\pi }{2}} {\sqrt {2 + \cos x} .\sin x{\rm{d}}x} \). Nếu đặt \(t = 2 + \cos x\) thì kết quả nào sau đây đúng?	</title>
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