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March 25, 2017

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Simplify: cos x cos x
----- + -----
sec x-1 sec x+1

  • trig - ,

    is that
    cosx/(secx - 1) + cosx/(secx + 1) ???

    of so, then using a common denominator , ...
    (cosx(secx + 1) + cosx(secx - 1)) / (sec^2 x - 1)
    = cosx(2secx)/tan^2x
    = cosx(2/cosx) ( cos^2x/sin^2x
    = 2cot^2 x

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