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⌊ ∫ 0. ∞ E. - X. 2 D. X. ∫ 0. ∞ E. - X. 2 COS. 2 X. D. X. ⌋ = 还是 左\ lfloor \ frac {\ displaystyle {\ int_ {0} ^ {\ infty} e ^ { - x ^ 2} \,dx}} {\ displaystyle {\ int_ {0} ^ {\ infty} e ^ {-x ^ 2} \ cos 2x \,dx}} \ rick \ rfloor = \? ⎣⎢⎢⎢⎢⎢∫0.∞E.-X.2COS.2X.D.X.∫0.∞E.-X.2D.X.⎦⎥⎥⎥⎥⎥=还是
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