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	Các bình luận về: Giả sử tích phân \(I = \int\limits_{ &#8211; \frac{\pi }{2}}^{\frac{\pi }{2}} {\frac{{{x^2} + \cos x}}{{1 + {3^x}}}dx} = a{\pi ^3} + b\pi + c\), trong đó \(a,b,c \in \mathbb{Q}\). Tính \(S = 8a + 4b + c\)	</title>
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