SOLUTION: Please help me simplify this expression: (y^-2 - x^-2)/(y^-2 + x^-2)

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Question 364570: Please help me simplify this expression:
(y^-2 - x^-2)/(y^-2 + x^-2)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Please help me simplify this expression:
(y^-2 - x^-2)/(y^-2 + x^-2)
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(1/y^2 - 1/x^2)/ (1/y^2 + 1/x^2)
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(x^2-y^2)/(x^2y^2) * [x^2y^2/(x^2+y^2)]
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= (x^2-y^2)/(x^2+y^2)
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Cheers,
Stan H.