A) \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}+{{b}^{2}}\]
B) \[\tan \alpha .\tan \beta =\frac{{{b}^{2}}({{x}^{2}}+{{a}^{2}})}{{{a}^{2}}({{y}^{2}}+{{b}^{2}})}\]
C) \[\tan \alpha .\tan \beta =\frac{{{a}^{2}}}{{{b}^{2}}}\]
D) All of the above
E) None of these
Correct Answer: A
Solution :
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