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Math Help - Where can I find the formal way of this formula?

  1. #1
    Junior Member
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    Where can I find the formal way of this formula?

    In this link -

    Pauls Online Notes : Linear Algebra - Examples of Linear Transformations

    When he is talking about 2D rotations, he says -



    Now, through a trig formula we can write the equations for w as follows,




    I was wondering where a formal definition for this formula can be found. Thanks for any help.
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  2. #2
    MHF Contributor
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    Re: Where can I find the formal way of this formula?

    What do you mean by the "definition of a formula"? The identities for the sine and cosine of a sum of angles are found here.
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