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: New to the forums, trouble with an integral

  1. Feb 3, 2008 #1
    Hello all, I am new to these forums. I'm having trouble with a problem on homework. It seems simple but it is giving me problems.

    It is an indefinite integral: Integral of (Sin(2x))/(Sinx)dx

    Is there a way to use substitution? Help is appreciated.
     
  2. jcsd
  3. Feb 3, 2008 #2
    [tex]\int\frac{\sin{2x}}{\sin x}dx[/tex]

    Use the trig identity.

    [tex]\sin{2x}=2\sin x \cos x[/tex]
     
  4. Feb 3, 2008 #3
    Use the identity:

    [tex]sin(2x) = 2sin(x)cos(x)[/tex]
     
  5. Feb 3, 2008 #4
    roco, that is correct. Obviously a newb, I have no idea how you did that. I'm sure there are stickies somewhere that I need to read.
     
  6. Feb 3, 2008 #5
    Introducing LaTeX Math Typesetting - https://www.physicsforums.com/showthread.php?t=8997

    Enjoy!
     
  7. Feb 3, 2008 #6
    Alright, wow that is simple when you now the identities. Guess i should get to learning those lol thx awvvu
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...