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Z = 1/4(p² + 16)^1/2 + 2 - 1/5 p
Z' = (1/4)(1/2)(p² + 16)^-1/2- 1/5
= 1 - 1
8(p² + 16)^1/2 5
= 1 - 1
8√(p² + 16) 5