1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Finding Cartesian equation of parametric surface.

  1. Oct 8, 2009 #1


    User Avatar

    1. The problem statement, all variables and given/known data
    Find the Cartesian equation of the parametric surface: [2cos(t)cos(s), 3sin(s), sin(t)cos(s)]

    Find eqn. of the tangent plane when S = 0, t = pi/2

    2. Relevant equations

    3. The attempt at a solution

    I'm not quite sure what to do. All I've done is squared each term, which gave me.

  2. jcsd
  3. Oct 8, 2009 #2
    [tex]x=2\cos t\cos s[/tex]

    [tex]y=3\sin s[/tex]

    [tex]z=\sin t \cos s[/tex]

    Can't you find [tex]\alpha[/tex] and [tex]\beta [/tex] so that [tex]x^2+\alpha y^2 + \beta z^2= constant[/tex]?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook