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5.28.1  Rewrite hyperbolic functions as exponentials: hyp2exp

hyp2exp takes as argument an hyperbolic expression.
hyp2exp rewrites each hyperbolic functions with exponentials (as a rational fraction of one exponential, i.e. without linearization).
Input:

hyp2exp(sinh(x))

Output:

(exp(x)-1/(exp(x)))/2

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