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    ag1538 Posts: 1, Reputation: 1
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    #1

    Feb 22, 2010, 06:37 PM
    establishing identities help
    establish the identity:

    sec(to the 4th power) - sec(squared)= tan (to the 4th power) + tan (squared)
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    galactus Posts: 2,271, Reputation: 282
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    #2

    Feb 23, 2010, 05:07 AM

    This is rather straightforward. Just use the identity .

    Sub it in and it'll fall into place.
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