Results 1 to 2 of 2

Math Help - Trig Identity question

  1. #1
    Senior Member sakonpure6's Avatar
    Joined
    Sep 2012
    From
    Canada
    Posts
    383
    Thanks
    28

    Trig Identity question

    Trig Identity question-untitled.png
    I solved this and I got -n for both a) and b) . Am I just tired and can't do math any more or what ????
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Nov 2013
    From
    California
    Posts
    2,231
    Thanks
    852

    Re: Trig Identity question

    Quote Originally Posted by sakonpure6 View Post
    Click image for larger version. 

Name:	Untitled.png 
Views:	6 
Size:	5.2 KB 
ID:	30095
    I solved this and I got -n for both a) and b) . Am I just tired and can't do math any more or what ????
    \cos(\pi+x)=\cos(\pi)\cos(x)-\sin(\pi)\sin(x)=-\cos(x)=-n

    \sin(\frac{3\pi}{2}+x)=\sin(\frac{3\pi}{2})\cos(x)  +\cos(\frac{3\pi}{2})\sin(x)=-\cos(x)=-n

    looks like you got both right to me.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. trig identity question
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: August 13th 2010, 05:30 PM
  2. another trig identity question
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: April 9th 2010, 08:41 PM
  3. Trig identity question
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: May 14th 2009, 11:33 AM
  4. Trig identity question!
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: February 8th 2009, 07:05 AM
  5. Little trig identity question.
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: September 17th 2008, 01:06 PM

Search Tags


/mathhelpforum @mathhelpforum