I want to do trigreduce to x and z respectively.
f = Cos[x]^3*Cosh[z]^2 *Sinh[z]
I want to get the result in the following form
f = 3/16*Cos[x]Sinh[z]+1/16*Cos[3x]Sinh[z]+3/16*Cos[x]Sinh[3z]+1/16Cos[3x]Sinh[3z]
Do anyone can help me? Thank you very much!