1.

The locus of the point of intersection of perpendicular tangents to the ellipse \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\], is               [MP PET 1995]

A.            \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}-{{b}^{2}}\]                                   
B.            \[{{x}^{2}}-{{y}^{2}}={{a}^{2}}-{{b}^{2}}\]
C.            \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}+{{b}^{2}}\]                                  
D.            \[{{x}^{2}}-{{y}^{2}}={{a}^{2}}+{{b}^{2}}\]
Answer» D.            \[{{x}^{2}}-{{y}^{2}}={{a}^{2}}+{{b}^{2}}\]


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