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The range of values of a such that the a...

The range of values of `a` such that the angle `theta` between the pair of tangents drawn from `(a,0)` to the circle `x^2+y^2=1` satisfies `pi/2

A

a)(1,2)

B

b)`(1,sqrt2)`

C

c)`(-sqrt2,-1)`

D

d)`(-sqrt2,-1)cup(1,sqrt2)`

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A DAS GUPTA-Circles-EXERCISE
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  16. (C) 2 45. Three concentric circles of which the biggest is x^2+ y^2= 1...

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