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Homework Help: Small question

  1. Jan 15, 2006 #1
    Solve sin(x-y) when x= [0, pi/2], y=[pi/2, pi].

    I am just not familier with the notations.

    Does the above mean that I need to find the value of sin (x-y), for (x,y)= (0, pi/2) and (pi/2, pi)?

    Why would they write x and y like this??


    Last edited: Jan 15, 2006
  2. jcsd
  3. Jan 15, 2006 #2


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    I haven't the slightest idea of what they have meant. The notation, if not meaningless, is at the very least obscure and non-standard.
  4. Jan 15, 2006 #3


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    What, exactly, is the wording of the problem? You can solve an equation or, more generally, a "problem" but you can't "solve" a function.
    "Solve sin(x-y)" makes no sense. Does the problem ask you, possibly to solve "sin(x-y)= 0" or to find maximum and minimum values for the function?
  5. Jan 15, 2006 #4
    Thanks guys for the replies.

    This is exactly the wording of the problem.

    I do felt the same way as you felt. Meaningless question. Only way I would do this is to write sin(x-y)= sinx cosy - cosx siny and substitue values.


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