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定积分∫xf(x)dx
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定积分∫e^(-x^2)dx
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定积分∫cosx²dx
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定积分∫cosx²dx求导
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定积分∫1/根号(1+x^2)dx
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定积分∫e^(x^2)dx负无穷到正无穷
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定积分∫dx等于多少
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定积分∫0dx等于多少
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定积分∫e^(-ax^2)dx
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