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Homework Help: Show that the triangle is a right triangle

  1. Apr 29, 2009 #1
    If angles A, B, and C are the angles of a triangle such that sin(A+B)=1/sin(C) and cos(A+B)=cos(C), then show that the triangle is a right triangle.
  2. jcsd
  3. Apr 29, 2009 #2
    You need to show your work. But for starters, one way that you can approach this problem is to solve for "A+B" in both equations in terms of "C". Then you can solve for "C" using these two equations. Last, solve for A and B.
  4. Apr 29, 2009 #3
    Yeah, compound angle formulae a-gogo!
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