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Hi,

I am new to this forum and I found about this forum on talk.collegeconfidential.com. Well I have been having some trouble with my Calc II work . It would be great if someone could explain this problem to be

Find the total length of the astroid x=a (cos t)^3, y=a (sin t)^3, where a>0.

I think I know how to find the equation for the integral but I don't know how to find the limits.

Here is the work that I did so far:

x'=-3a cos^2 sin

y'= 3a sin^2 cos

I set those equal to zero to find the critical points. I got 0, pi/2, pi, 3pi/2, 2pi. Then I got stuck. I tried graphing it in the parametric mode in my calculator but I got a weird looking graph...

Any help would be appreciated. Thanks.

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# Homework Help: Calculus II homework help

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