Verify the hyperbolic identites

  1. 1. The problem statement, all variables and given/known data

    verify these identities:

    1) tanh^2 x + sech^2 x =1
    2) sinh(x+y) = sinh cosh y + cosh x sinh y


    2. Relevant equations

    cosh2x - sinh2x = 1
    sech2x + tanh2x = 1
    coth2x - csch2x = 1

    sinh (x ± y) = sinh x cosh y ± cosh x sinh y
    cosh (x ± y) = cosh x cosh y ± sinh x sinh y
    tanh(x ± y) = (tanh x ± tanh y)/(1 ± tanh x.tanh y)
    coth(x ± y) = (coth x coth y ± l)/(coth y ± coth x)
     
  2. jcsd
  3. Um, the identities are given to you in your "relevant equations." What is it you are asking?
     
  4. Pretty sure you are suppose to show us what you did first..
     
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