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Hyperbolic cosine/R/Power series/Odd Coefficients 0/Exercise
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Prove that in the power series
∑
n
=
0
∞
c
n
x
n
{\displaystyle {}\sum _{n=0}^{\infty }c_{n}x^{n}}
of the hyperbolic cosine the coefficients
c
n
{\displaystyle {}c_{n}}
are
0
{\displaystyle {}0}
if
n
{\displaystyle {}n}
is odd.
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