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Please help, Contest questions

  1. Feb 10, 2005 #1
    1) What kind of triangle is ABC if for his angles we have:
    sin[2*(alfa)]=2sin[beta]*cos[gama]

    2) If acos[alfa] + bsin[alfa]=acos[beta]+b[sin[beta] , prove that sin(alfa+beta)=2ab/(a^2+b^2)
     
  2. jcsd
  3. Feb 11, 2005 #2

    dextercioby

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    For question #1,are u sure that equilateral triangle is the only possibble sollution...?

    Daniel.
     
  4. Feb 11, 2005 #3

    dextercioby

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    I wanted to tell u that the "HINT" for the second problem would have led nowhere...

    Daniel.
     
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