cosx=[e^(ix)+e^(-ix)]/2
e^x cosx=[e^(1+i)x+e^(1-i)x]/2=1+a1x+a2x^2/2!+..anx^n/n!+....
an=[(1+i)^n+(1-i)^n]/2=[(√2)^n(cosnπ/4+isinnπ/4)+(√2)^n(cos-nπ/4+isin(-nπ/4)]/2
=2^(n/2)cos(nπ/4)
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