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: Q Find the curve whose polar subtangent is constant

  1. Jun 22, 2005 #1
    I have done this thing::
    [tex]\frac{rsin(\theta)}{k}= - \frac{r+tan(\theta) \frac{dr}{d\theta}}{-rtan\theta + \frac{dr}{d\theta}}[/tex]

    Rearranging and solving i got

    [tex]rsin \theta \frac{d(rcos\theta)}{d\theta}=-k\frac{d(rsin\theta)}{d\theta}[/tex]

    on further solving i got
    [tex] rcos\theta= -kln(rsin\theta) +c [/tex]

    But the answer at the back is ::
    :: The Reciprocal Spiral ::
    :: r(\theta - \alpha) = c::

    Where I went wrong ::Pls Help
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted