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How would you show that 1/ (1 + cos x) = tan (x/2) +c watch

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    I am so so so confused
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    (Original post by TeeEm)
    cos2x = 2cos2x - 1
    cosx = 2cos2(x/2) - 1
    Then what
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    (Original post by APersonYo)
    Then what
    Susbtitute for \cos x using the identity TeeEm gave you. Please post all your working if you get stuck.
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    (Original post by notnek)
    Susbtitute for \cos x using the identity TeeEm gave you. Please post all your working if you get stuck.
    I usually post my working. But I am so stuck on this question I have no working
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    (Original post by APersonYo)
    I usually post my working. But I am so stuck on this question I have no working
    TeeEm showed you this:

    cosx = 2cos2(x/2) - 1

    So change the cos(x) in 1/(1+cos(x)) using the above identity. Try this and please post what you get if you get stuck.
 
 
 
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Updated: February 6, 2017
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