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-   -   Trig problem (https://www.askmehelpdesk.com/showthread.php?t=735721)

  • Feb 23, 2013, 09:14 AM
    Scottgesq
    trig problem
    Hi,

    I need a little help with an equation I got for math. It is as following:
    sinē (x) . Cosē (y) + cosē (x) . Sinē (y) + sinē (x) . Sinē (y) + cosē (x) . Cosē (y) = 1

    Now I tried to complete the exercise, but I got stuck. Let me show you what I did.

    We know:
    sin (x) . Cos (y) + cos (x) . Sin (y) = sin (x + y)

    So I thought:
    sinē (x) . Cosē (y) + cosē (x) . Sinē (y) = sinē (x + y)

    Same for:
    sin (x) . Sin (y) + cos (x) . Cos (y) = cos (x - y)

    So I also thought:
    sinē (x) . Sinē (y) + cosē (x) . Cosē (y)= cosē (x - y)

    That gives us:
    sinē (x+y) + cosē (x-y)

    And that's where I got stuck. So anybody knows where I made an error / knows how I should continue?

    Cheers,
    A student
  • Feb 23, 2013, 09:18 AM
    Scottgesq
    Sorry I posted this in the wrong category, feel free to delete this admins.
    My apologies.
  • Feb 23, 2013, 09:35 AM
    Wondergirl
    >thread closed<

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