calculus
posted by soffy .
find the taylor series f(x)1/2(e^x + e^x) ;x=0

calculus 
Steve
since this is just f(x) = cosh(x), and the derivatives are sinh,cosh,sinh,cosh,...
f(x) = 1 + x^2/2! + x^4/4! + x^6/6! + ...
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