Question: define new function

Hi everyone:

I want to earn f(zeta) and zeta=x/a while the f(x) is: 

f:=(x)->A1*sin(k*x)+A2*cos(k*x)+A3*sinh(k*x)+A4*cosh(k*x)

zeta=x/a and a, k, A1..A4 are constants. 

f(zeta)=? 

 

 

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