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Which formula gives the hyperbolic cosine, cosh x?
A(e^x - e^(-x))/2
B2/(e^x - e^(-x))
C(e^x + e^(-x))/2
D(e^x + 1)/(e^x - 1)
Answer & Solution
Correct answer: C. (e^x + e^(-x))/2
cosh x is the even part of the exponential function, the average of e^x and e^(-x).
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