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y=x^2和y=10交點座標為(-√10,10),和(√10,10), 以Y軸為對稱軸,左右對稱, x=±√y, V=∫(0→10)π(√y)^2dy =∫(0→10)πydy =πy^2/2(0→10) =π(10^2-0)/2=50π.
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