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Trig proof with two angles and many functions

  1. Jun 19, 2011 #1
    1. The problem statement, all variables and given/known data
    Prove:
    cotAcotB=(cscB+cotA)/(tanAsecB+tanB)


    2. Relevant equations
    cotx=1/tanx, etc.
    I tried using pythagorean identities, like 1+cot2x=csc2x, and others, but I've been unable to solve the problem.


    3. The attempt at a solution
    Please help me out. The examples in my text book don't seem very useful here. I've tried everything I could think of.
     
  2. jcsd
  3. Jun 19, 2011 #2

    eumyang

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    Homework Helper

    You need to show some work, but here's a big hint. Start from the right side. Convert everything in terms of sines and cosines. You'll have a complex fraction. Add the two fractions in the numerator, and then add the two fractions in the denominator. Take it from here.
     
  4. Jun 19, 2011 #3
    Thanks. I finally figured it out.
     
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