1.

Let P be a variable point on the ellipse \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\] with foci \[{{F}_{1}}\] and \[{{F}_{2}}\]. If A is the area of the triangle \[P{{F}_{1}}{{F}_{2}}\], then maximum value of A is [IIT 1994; Kerala (Engg.) 2005]

A.            ab   
B.            abe
C.            \[\frac{e}{ab}\]                         
D.            \[\frac{ab}{e}\]
Answer» C.            \[\frac{e}{ab}\]                         


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