Sympy cannot find the laplace transform of sinh (t)
Question: I have been using **sympy** for quite a few months now, and recently I have
run into a problem.

The following code is supposed to calculate the Laplace Transform of
**sinh(t)**.

    
    
    from sympy import *
    from sympy.abc import *
    laplace_transform(sinh(t), t, s, noconds = True)
    

But, it fails to calculate anything and returns: `LaplaceTransform(sinh(t), t,
s)`

Can anyone tell me what's wrong?

(I am using `sympy-0.7.5` with `Python-2.7.7` on Windows 7 SP1 x64)


Answer: Apparently it doesn't try to rewrite the function. If you do so explicitly you
will find your answer:

    
    
    >>> sinh(t).rewrite(exp)
    exp(t)/2 - exp(-t)/2
    >>> laplace_transform(_, t, s, noconds=True)
    1/(s**2 - 1)
    

