Results 1 to 3 of 3

Math Help - Minor help with integrals

  1. #1
    Newbie
    Joined
    Apr 2010
    Posts
    15

    Minor help with integrals

    Needing to evaluate the integral:

    sin(2x)/(47+(cos(x))^2)dx

    This question might belong somewhere else but.. It's been a while since I've taken trig and is (cos(x))^2 the same as cos^2(x) or 2cos(x) or something entirely different?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member General's Avatar
    Joined
    Jan 2010
    From
    Kuwait
    Posts
    562
    Rewrite sin(2x) as 2sin(x)cos(x)

    then substitute u=cos^2(x) ..
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Apr 2010
    Posts
    15
    ahh, thanks. I'm not good with trig identities.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Length of minor arc?
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: August 2nd 2011, 11:00 AM
  2. Chords and Minor Arcs
    Posted in the Geometry Forum
    Replies: 1
    Last Post: April 7th 2011, 05:05 AM
  3. Possibly a minor puzzle
    Posted in the Math Puzzles Forum
    Replies: 8
    Last Post: January 31st 2011, 11:15 AM
  4. Physics Minor for Math Major
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: October 22nd 2010, 01:26 PM

Search Tags


/mathhelpforum @mathhelpforum