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    (cos^2x-sin^2x) = ?
    can someone please factorise that for me please.
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    (cosx-sinx)(cosx+sinx)
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    cheers mate.
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    Difference of 2 squares, basically a timesaving rule.
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    or just cos(2x)

    but i dont know if that counts as factorisation.... :confused:
 
 
 

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