Precalculus

I have been trying to verify the below identity. I have been at it for hours, can anyone please help?

1+ cos(theta)/Cos(theta) = tan^2(theta)/sec(theta)-1

asked by George
  1. (1+cos)/cos = sec + 1
    = (sec+1)(sec-1) / (sec-1)
    = (sec^2-1)/ (sec-1)
    = tan^2/(sec-1)

    The clue was that sec-1 sitting there on the right side.

    posted by Steve

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