This involves trig functions so I am not sure if I am on the right track

y = (tan^2 x)/x 0 <= x <= pi/4

a = 0; b=pi/4 on the x-axis

so I think I should use the formula 2pi (integral sign "S") x f(x) dx

v = 2 pi S a=0; b=pi/4 x (tan^2 x)/x dx

so I am thinking the x's cancel each other out and I have

v= 2 pi S tan^2 x dx

v = 2 pi ((1/3)sec^6)

Am I on the right track??

Thanks

Calculus Beginner