Q. 10

# When simplified (*x*^{-1} + *y*^{-1})^{-1} is equal to

A. *xy*

B. *x* + *y*

C.

D.

Answer :

(*x*^{-1} + *y*^{-1})^{-1}

= ( + ) ^{-1}

= () ^{-1}

= ()

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