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-   -   How would I prove cos(x-y)/cosxcosy=1+tanxtany (https://www.askmehelpdesk.com/showthread.php?t=175972)

  • Jan 23, 2008, 08:30 PM
    aamm
    how would I prove cos(x-y)/cosxcosy=1+tanxtany
    how would I prove cos(x-y)/cosxcosy=1+tanxtany
  • Jan 24, 2008, 01:16 AM
    jiten55
    cos(x-y) = cosx cosy + sinx siny

    divide both sides by cosx cosy

    (remember: sinA/cosA = tan A)

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