Thursday, 28 December 2017

trigonometry - Confirmation of Proof: cos2(x)=frac12big(1+cos(2x)big) using Euler's identity?



How can I prove the following equation: cos2(x)=12(1+cos(2x)), using Euler's identity? eiπ+1=0.






I have tried equating Euler's equation to cos on one side and squaring that but haven't had luck reducing it to the desired form as outlined in (1).

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