A.\(V = \pi \int\limits_a^b {{f^2}\left( x \right)dx} \)  
B.\(V = 2\pi \int\limits_a^b {{f^2}\left( x \right)dx} \)  
C.\(V = {\pi ^2}\int\limits_a^b {{f^2}\left( x \right)dx} \)  
D.\(V = {\pi ^2}\int\limits_a^b {f\left( x \right)dx} \)

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