Results 1 to 3 of 3
Like Tree1Thanks
  • 1 Post By MarkFL

Math Help - if tanx + tany = 25 and cotx + coty =30, what is tan(x+y)...please help with this que

  1. #1
    Newbie
    Joined
    May 2012
    From
    kanaida
    Posts
    17

    if tanx + tany = 25 and cotx + coty =30, what is tan(x+y)...please help with this que

    i have no idea how to do this....
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor MarkFL's Avatar
    Joined
    Dec 2011
    From
    St. Augustine, FL.
    Posts
    1,988
    Thanks
    734

    Re: if tanx + tany = 25 and cotx + coty =30, what is tan(x+y)...please help with this

    A good place to begin is to look at the angle sum identity for the tangent function:

    \tan(\alpha+\beta)=\frac{\tan(\alpha)+\tan(\beta)}  {1-\tan(\alpha)\tan(\beta)}

    Now we can see we have the numerator taken care of, so let's see if we can get what we need for the denominator from the given equation involving the cotangent function:

    \cot(x)+\cot(y)=\frac{1}{\tan(x)}+\frac{1}{\tan(y)  }=\frac{\tan(x)+\tan(y)}{\tan(x)\tan(y)}

    Now we can get what we need, do you see how to proceed?
    Thanks from topsquark
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jan 2013
    From
    fuzhou
    Posts
    4

    Re: if tanx + tany = 25 and cotx + coty =30, what is tan(x+y)...please help with this

    YES! I finally found this web page! Iíve been looking just for this article for so long!!
    Doudoune Burberry Femme
    Doudoune Ralph Lauren Homme
    Cheap North Face Jackets
    Belstaff Jackets
    Goyard Handbags
    Ugg Boots Outlet
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 5
    Last Post: November 13th 2012, 04:06 PM
  2. Replies: 1
    Last Post: November 13th 2012, 03:24 PM
  3. Prove:(tanx/(1+tanx)) = (sinx/(sinx+cosx))
    Posted in the Trigonometry Forum
    Replies: 7
    Last Post: February 2nd 2011, 08:46 PM
  4. quick solution required for DE of TanX*TanY=C?
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: February 21st 2010, 12:17 PM

Search Tags


/mathhelpforum @mathhelpforum