What is the value of{1} \over{x^{2}-y^{2}} *{-1}\over{x^{2}+2xy+y^{2}}?
1.2y=x^{2}-y^{2}
2.x+y=4
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AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
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BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
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CBOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
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DEACH statement ALONE is sufficient.
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EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: C