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Math Help - double angle problems

  1. #1
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    double angle problems

    Simplify.
    1. 2cos^2 4x-1
    sin4xcos4x





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

    The answers to the first is 2cot8x and the second is cos^22x. I would like to see the step by step process.
    Help would be appreciated thanks!
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by andrewsx View Post
    Simplify.
    1. 2cos^2 4x-1
    sin4xcos4x





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

    The answers to the first is 2cot8x and the second is cos^22x. I would like to see the step by step process.
    Help would be appreciated thanks!
    And what was wrong with Jhevon's answer? If you have a question about his answer, please respond in the original thread.

    And please don't double post. See rule #1 here.

    -Dan
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  3. #3
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    Unhappy

    Sorry, when I logged into the forum, I didn't know where to find my thread from yesterday and any replies that may have accrued. I should check my email from now on so that i can see who replied.
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by andrewsx View Post
    Sorry, when I logged into the forum, I didn't know where to find my thread from yesterday and any replies that may have accrued. I should check my email from now on so that i can see who replied.
    When you log in there will be a blue bar near the top of the page with several options on it. Click on "New Posts", which is about 3/4 across the page. This will show you all the posts that have been made since you last logged on.

    -Dan
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