Cho hàm số \(y=f(x)\) liên tục trên [a;b] \(\left( {a,b \in R,a...

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

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

C. \(V = \frac{1}{3}\pi \int\limits_a^b {{{\left( {f\left( x \right)} \right)}^2}} dx.\)

D. \(V = \pi \int\limits_b^a {{{\left( {f\left( x \right)} \right)}^2}} dx.\)