I have a large argument, so I'd rather neglect exp(-x) in the definition of 
sinh. How do I substitute sinh by 1/2*exp ?

I tried .subs({sinh: 0.5*exp}) and .subs({2 * sinh: exp}) but it doesn't 
work: TypeError: unsupported operand type(s) for *: 'int' and 
'FunctionClass'.

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