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: Simplifying a trigonometric product

  1. Oct 2, 2012 #1
    Was just double checking if we can simplify this in the following way,

    ∫ sinx * √(1 + cos2x) dx = ∫ sinx * (1 + cosx) dx
     
  2. jcsd
  3. Oct 2, 2012 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    No.

    Is [itex]\sqrt{3^2+4^2}=7\ ?[/itex] No !

    [itex]\sqrt{3^2+4^2}=\sqrt{25}=5\ .[/itex].

    To solve that integral, use substitution .

    Ask your self, what's the derivative of cos(x) ?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook