1. Not finding help here? Sign up for a free 30min 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!

Simplifying after applying chain rule

  1. Oct 1, 2011 #1
    1. The problem statement, all variables and given/known data

    http://images.calcchat.com/solutionart/etf5e/03/d/se03d01063.png [Broken]

    2. Relevant equations



    3. The attempt at a solution
    I get to the third row, but cant simplify (Sin2θ)(Cos2θ). I'm looking at the trigonometric double angle formulas, and still cant figure out how the final answer came to be 1/2(Sin4θ)
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 1, 2011 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    2sin(x)cos(x) = sin(2x) .

    That should help.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook