A) x and y vary directly
B) \[{{x}^{2}}+\text{ }{{y}^{2}}\] and \[{{x}^{2}}-\text{ }{{y}^{2}}\] vary directly
C) Both A and B
D) \[{{x}^{2}}+\text{ }{{y}^{2}}\] and \[{{x}^{2}}-\text{ }{{y}^{2}}\] vary indirectly
E) None of these
Correct Answer: C
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