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Mathematics
Problem
For the hyperbola
x
2
cos
2
α
−
y
2
sin
2
α
=
1
\frac{x^2}{\cos^2 \alpha} - \frac{y^2}{\sin^2 \alpha} = 1
c
o
s
2
α
x
2
−
s
i
n
2
α
y
2
=
1
, which of the following remains constant when
α
\alpha
α
varies a. abscissae of vertices b. abscissae of foci c. eccentricity d. directrix
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