ok...this was meant to be a fun problem :grumpy: but looks like I don't deserve to have fun!!!(adsbygoogle = window.adsbygoogle || []).push({});

How am I meant to derive trig identities like sin(x)cos^3(x) from some complex **** like [tex]\left( {e}^{{\it ix}} \right) ^{n}={e}^{{\it ixn}}[/tex]!!! I just don't get the idea!!!

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# (e^ix)^n=(e^ixn) & Trig identities

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