\[(a)\;\frac{p}{2}\bigg(\frac{1}{u}+\frac{1}{v}\bigg)\quad (b)\;p\bigg(\frac{1}{u}+\frac{1}{v}\bigg) \quad (c)\;\frac{p}{2}\bigg(\frac{1}{u}-\frac{1}{v}\bigg) \quad (d)\;p\bigg(\frac{1}{u}-\frac{1}{v}\bigg)\]

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