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繞x軸旋轉 V=∫(0,1)πx^2 dx -∫(0,1)πx^4 dx =π(x^3/3-x^4/4)|(0,1) =π/12 繞y軸旋轉 V=∫(0,1)πy dy -∫(0,1)πy^2 dy =π(y^2/2-y^3/3)|(0,1) =π/6
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