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Simplify : [(p^(- 1)+q^(- 1))(p^(- 1)-q^...

Simplify : `[(p^(- 1)+q^(- 1))(p^(- 1)-q^(- 1))-:(1/(p^(- 1))-1/(q^(- 1)))(1/(p^(- 1))+1/(q^(- 1)))](p q)^2.`

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