If two tangents can be drawn to the different branches of hyperbola x2/1 - y2/4 = 1 from the point ( a, a2) then a belongs to
a) (-2,0)
b) (0,2)
c) (- infinity , -1)
d) (2, infinity)
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A ( -2, 0)
2x- y/2 =1
4x - y = 2
2x- y/2 =1
4x - y = 2
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