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Thread: identity problem

  1. November 1st 2009, 03:34 PM #1
    yaykittyeee
    yaykittyeee is offline
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    identity problem

    i'm having trouble on this one.

    sec^3A-cos^3A/secA-cosA=2+cos^2A+tan^2A

    i expand the numerator and eliminate the (secA-cosA) and i get..

    sec^2A+secAcosA+cos^2A=2+cos^2A+tan^2A

    and then i make secAcosA= to 1 but then i get stuck, could someone help me with this please?
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  2. November 1st 2009, 04:00 PM #2
    umgambit
    umgambit is offline
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    Well,
    secēA+cosAsecA+cosēA=1/cosē+1+cosēA=(cosē+sinē)/cosē+1+cosēA=1+sinē/cosē+1+cosēA=2+tanēA+cosēA.
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