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Math Help - Establish or refute

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    Establish or refute

    Establish or refute the propsed identity tan^2(a)-cos^2(a)= sin^2(a).
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    Hello,

    Quote Originally Posted by christenc05 View Post
    Establish or refute the propsed identity tan^2(a)-cos^2(a)= sin^2(a).
    \Longleftrightarrow \tan^2(a)=\sin^2(a)+\cos^2(a)

    \Longleftrightarrow \tan^2(a)=1

    One can see that this is not true for any value of a
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