I got -z/(a² -z²) - z/(a² + z²) for my answer is that correct?
No.
The correct answer after a lot of simplifications is:
-(2*z*a^2)/(a^4-z^4)
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Verified answer
No.
The correct answer after a lot of simplifications is:
-(2*z*a^2)/(a^4-z^4)