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Math Help - more trouble completing identity...

  1. #1
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    more trouble completing identity...

    tan^2 A - 3sin A tan A sec A

    Any ideas on where to begin?
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  2. #2
    Junior Member toraj58's Avatar
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     = \tan^2a - 3\sin a \tan a \frac {1}{\cos a}

     = \tan^2a - 4\tan a

     = \tan a (\tan a - 4)
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