2008-10-02, 05:04 PM
psychopat Wrote:If t is a variable and not a function, then yes that's legal.
If t is a function, I'm not 100% sure but I think it's also legal... not sure.
the whole problem is (vector) integrating.
i simplified the integral to look like:
inte[sqrt(144(cos²(2t) + sin²(2t)) + 25)]dt
if i did cos²(2t) + sin²(2t) = 1, then it'd look like
inte[sqrt(144(1) + 25)]dt
=inte[sqrt(169)]dt
=inte[13]dt = 13t
the answer and final stepped looked to easy and simple so i wondered if doing that trig thing was legal lol. its suspicious when complicated math problems come out to have simple answers.