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-   -   Trig verification step by step? (https://www.askmehelpdesk.com/showthread.php?t=553350)

  • Feb 10, 2011, 04:14 PM
    nickhock3
    Verify:

    2-sec^2y
    cos2y= ----------
    sec^2y

    Please help.
  • Feb 10, 2011, 04:33 PM
    ebaines

    It took a while for me to understand what you're asking, but I believe it's this:



    The right hand side divides out like this:



    One of the first things to do when presented with functions of secant, cosecant, cotangent etc is to convert them to their sine and cosine equivalents - that makes it much easier to handle. So the right hand side becomes:



    Now hopefully you can see how it equals the left hand side: cos(2y).

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