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OpenStudy (anonymous):
Show by counterexample that (x+y)^-2 and x^-2+y^-2 are not equivalent.
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OpenStudy (asnaseer):
just pick some valu for x and another value for y, plug it into each of the two expressions and show that they are not equal. that is what a counterexample is.
OpenStudy (anonymous):
Oh, ok. Thank you!
OpenStudy (asnaseer):
yw :)
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