Discussion on: Advance Engineering Mathematics

Following is a discussion on the Reviewer item titled: Advance Engineering Mathematics.
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In reply to by Dyjin

f(x)=ln(tan(x)
f(x)=ln(tan(x)) - f(0)=0
f^1(x)=sec^2(x)/tan(x) - f(0)=0
:
.
f(x)=ln(tan(x))=0/0!+0/1!+...+0^n/n!+...
Therefore,
ln(tan(x))=Summation of (0^n/n!) with a lower limit of 0 and upper limit of infinity.