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Math Help - simplify

  1. #1
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    simplify

    how do i simplify this:
    (sin^2(a)+2cos(a)-1)
    and make it into
    (2cos(a)-cos^2(a))
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  2. #2
    Senior Member BAdhi's Avatar
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    Re: simplify

    use \sin^2{\theta}+\cos^2{\theta}=1
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  3. #3
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    Re: simplify

    can you explain more please.
    how do i get cos^2?
    i only got sin^2
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  4. #4
    Senior Member BAdhi's Avatar
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    Re: simplify

    From the given identity(in post #2) of course. use it to define sin^2 using cos^2. Come on, can't be more helpful
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  5. #5
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    Re: simplify

    wow, i still can't get it, can you elaborate please
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  6. #6
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    Re: simplify

    Quote Originally Posted by ahmedb View Post
    wow, i still can't get it, can you elaborate please
    Surely if \displaystyle \begin{align*} \sin^2{\theta} + \cos^2{\theta} \equiv 1 \end{align*} then \displaystyle \begin{align*} \sin^2{\theta} \equiv 1 - \cos^2{\theta}  \end{align*}

    Substitute this in place of \displaystyle \begin{align*} \sin^2{\theta} \end{align*} .


    You've asked very similar questions in about four different threads, surely you have learnt something by now...
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  7. #7
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    Re: simplify

    yes i did
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