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Input:
def(cosh(x))
Write:
`def(cosh(x))`
Compute:
$$def(cosh(x))$$
Output:
$$def(cosh(x))== \frac{1}{2}\ exp(x)+\frac{1}{2}\ exp((-x))$$ Result: $$\frac{1}{2}\ exp(x)+\frac{1}{2}\ exp((-x))$$
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