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Q.

From any point on the hyperbola x2y2=a2b2 two tangent are drawn to the ellipse x2/a 2+y2/b2=1.Then they make angles α  and  β such that

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a

tanαtanβ=1

b

tanαtanβ=1

c

tanα+tanβ=1

d

tanαtanβ=1

answer is C.

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Detailed Solution

Using y=mx±a2m2+b2

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