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Homework Help: Verify trigonometric identity

  1. Nov 3, 2008 #1
    1. The problem statement, all variables and given/known data

    verify the identity :
    1+sec(-∅)/sin(-∅+tan(-∅) = -csc ∅

    2. Relevant equations

    3. The attempt at a solution
    1+sec∅/-sin-tan∅ = -csc∅

    I don't know where to start from, does anyone have any idea?
  2. jcsd
  3. Nov 4, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi louie3006!

    Just do the obvious … multiply both sides by sin∅ + tan∅ :smile:
  4. Nov 4, 2008 #3
    do you mean conjugate the left side of the equation ?
  5. Nov 4, 2008 #4
    are those minus signs before ∅?
    i agree with tiny-tim, multiply both side by (sin∅ + tan∅) and you should see it.
    if it helps, you can rewrite sec, csc and tan in terms of sin and cos.
  6. Oct 9, 2010 #5
    I need to verify the identity of this problem

    tan^2(x/2)=(sec x-1)/(sec x+1)
  7. Oct 9, 2010 #6


    Staff: Mentor

    You have already started a new thread for this problem, which is the right thing to do.
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