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-   -   Use tri identities to simplify (https://www.askmehelpdesk.com/showthread.php?t=215911)

  • May 14, 2008, 10:53 AM
    dejalisco5
    use tri identities to simplify
    cos^2 x - sin^2 x/ cos^4 x - sin^4 x
  • May 14, 2008, 11:00 AM
    galactus
    Notice the difference of two squares in the num. and den.?.

    Remember that

    Actually this whittles down to something very simple.

    Remember the identity:

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