Thursday, 19 November 2015

trigonometry - Rewriting a trig function into a sum of exponential functions



Rewrite the function 2+4sin(πt+π6) into a sum of exponential functions. By that I mean using Euler's formula sin(x)=eiπxeiπx2i.



If it wasn't for the π6 term, this wouldn't be a problem for me, but I'm not sure what I can do to fix that.


Answer



Using additional formulas:

2+4sin(πt+π6)=2+4sin(πt)cosπ6+4cos(πt)sinπ6=
=2+23eiπ2t+eiπ2t2+2eiπ2teiπ2t2i


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