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Find the relative error in Z, if Z = A^(...

Find the relative error in Z, if Z = `A^(4)B^(1/3)/CD^(3/2)`.

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The relative erro in Z is `DeltaZ//Z = 4(DeltaA//A)+(1//3)(DeltaB//B)+(DeltaC//C)+(3//2)(DeltaD/D)`.
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