Results 1 to 4 of 4

Math Help - Technical trig question......

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    34

    Technical trig question......

    Hi,
    I have a trig question here which someone has tried to explain to me but I just cant follow what's going on with it. Can someone please attempt this and explain it in simple terms what each step is leading to. I've attached an image to make sure the question is understood correctly.

    Thanks
    David
    Attached Thumbnails Attached Thumbnails Technical trig question......-trig.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member
    Joined
    Jul 2009
    Posts
    397
    Hi Splint

    Maybe you can write the explanation you got and state the part that you don't understand
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Sep 2009
    Posts
    34
    OK, this was the reply:

    ................................................ |D
    ................................................ | h
    ................................................ |
    A ------- d ------- B ------ x ------ C

    let angle DAC =p and angle DBC = q
    take BC = x

    tan p = h/(x+b)
    x + b = h cot p ----------------- (1) (that's a typo, should be x+d)

    tan q = h/x
    x = h cot q ------------------ (2)
    subtract > (1) - (2) to get rid of x
    b = h[cot p - cot q] (that's another typo, should be d=)
    b = h[tab q - tan p]/tan p tan q (that's another typo, should be d=)
    h = b tan p tan q/[tan q - tan p] (that's another typo, should be =d)

    I've identified the typos myself but appart from that it is how the answer was written. It's the last two lines which I cant follow.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member
    Joined
    Jul 2009
    Posts
    397
    Hi Splint

    \cot p - \cot q

    =\frac{1}{\tan p}-\frac{1}{\tan q}

    =\frac{\tan q-\tan p}{\tan p~\tan q}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 4
    Last Post: March 28th 2011, 06:50 AM
  2. Highly technical website
    Posted in the Math Forum
    Replies: 0
    Last Post: August 10th 2010, 08:06 AM
  3. The Technical Calculus Question Ever
    Posted in the Calculus Forum
    Replies: 2
    Last Post: August 28th 2009, 10:09 AM
  4. [SOLVED] Power Series - technical question
    Posted in the Calculus Forum
    Replies: 0
    Last Post: April 20th 2009, 06:00 PM
  5. technical solution for this 2nd order de..
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: March 11th 2009, 08:41 PM

Search Tags


/mathhelpforum @mathhelpforum