If \( e \) and \( e_{1} \) are the eccentricities of the hyperbolas \( x y=c^{2} \) and \( x^{2}...

If \( e \) and \( e_{1} \) are the eccentricities of the hyperbolas \( x y=c^{2} \) and \( x^{2}-y^{2}=a^{2} \), then \( \left(e+e_{1}\right)^{2} \) is equal to
(a) 2
(b) 4
(c) 6
(d) 8
\( P \)
W.
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