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Mar
11
awarded  Supporter
Mar
11
awarded  Scholar
Mar
11
awarded  Editor
Mar
11
accepted Proving the cosine subtraction identity using complex numbers
Mar
11
revised Proving the cosine subtraction identity using complex numbers
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Mar
11
comment Proving the cosine subtraction identity using complex numbers
Okay, I see I mis-understood the problem ... I thought I was being told that I could complexify the right-hand side for the proof, rather than substituting the equivalent complex values using Euler's formulas as you've done. Thanks for the pointer :-)
Mar
11
awarded  Student
Mar
11
asked Proving the cosine subtraction identity using complex numbers