Question

Need help with working out the volume of a Tan(x) graph. My answer is always negative!

Answer 1

y=0 and x=pi/3
about the x-axis

Answer 2

So what are you integrating?

Answer 3

\[\pi*\int\limits_{0}^{\pi/3}(tanx)^2dx\]

Answer 4

ok that looks good

Answer 5

I was unsure whether the formula was correct

Answer 6

yeah since you are oscillating about the x-axis I would go with the integral of pi*y^2

Answer 7

after integrating tan^2x I get tanx-x.
using that after substituting pi/3 I get a negative volume which I believe is impossible

Answer 8

not sure what im missing

Answer 9

hmm let me see, are you in radian mode on calc.

Answer 10

Dammit!!!

Answer 11

I completely forgot about that

Answer 12

I was in degrees

Answer 13

Yeah that would do it, I think you were good.

Answer 14

thanks for the help