Find f′(x)f'(x)f′(x) if f(x)=ln(sinh(x))f(x) = \ln(\sinh(x))f(x)=ln(sinh(x)).
coth(x)\coth(x)coth(x)
tanh(x)\tanh(x)tanh(x)
1/sinh(x)1/\sinh(x)1/sinh(x)
cosh(x)\cosh(x)cosh(x)