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Math Help - Simplifying trig identities

  1. #1
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    Simplifying trig identities

    I have to do some problems in my textbook and these ones are throwing me off:

    1. tan^4x + 2tan^2x +1

    I would first factor out tan but the 2tan^2x is confusing me.

    2. 1 - 2cos^2x + cos^4x

    Same with this one, I've never seen a multiplier in these types of identities.
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  2. #2
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    Quote Originally Posted by clay10 View Post
    I have to do some problems in my textbook and these ones are throwing me off:

    1. tan^4x + 2tan^2x +1

    this expression is a perfect square ... factor it.

    2. 1 - 2cos^2x + cos^4x

    same thing here
    ...
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