factorise
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Step-by-step explanation:
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Answered by
1
Answer:
(x^2 + y^2)^-1
Step-by-step explanation:
x^2/x^4 - y^4 - y^2/x^4-y^4
x^2 - y^2/x^4 - y^4
x^2 - y^2/(x^2)^2 - (y^2)^2
x^2 - y^2/(x^2 - y^2)(x^2 + y^2)
1/x^2 + y^2
(x^2 + y^2)^-1
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