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Help on question!
Having a bit of trouble with some complex numbers! I was able to do the first bit: Find the roots of z^4+1=0 and show them in an Argand diagram and resolve z^4 into real real quadratic factors. But then got stuck on deduce that: cos2theta =2(costheta- cos pie/4) (cos theata-cos3pie/4) If ya...- schulzy
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- Forum: Mathematics Extension 2
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