Question: help with content of uploaded worksheet

please see the attached worksheet and assist me with understanding why these unusual results are computed.
 

simplify(op((diff(z/sqrt(z^2), [`$`(z, k)]))/pochhammer(1-k, k))[1]^(1/k), 'symbolic')

simplify(simplify(op((diff(z/sqrt(z^2), [`$`(z, k)]))/pochhammer(1-k, k))[2]^(-1/k)-op((diff(z/sqrt(z^2), [`$`(z, k)]))/pochhammer(1-k, k))[1]^(1/k)*z, 'symbolic'))


 

Download primes_help_1.mw

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