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Q.

The point  of intersection  of  two tangents  to  the  hyperbola  x2a2y2b2=1, the product of whose slopes is c2,  lies on the curve,

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a

y2+b2=c2(x2a2)

b

y2a2=c2(x2+a2)

c

y2b2=c2(x2+a2)

d

x2+b2=c2(x2a2)

answer is B.

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Detailed Solution

y=mx+a2m2b2

ymxa2m2b2=0

y2+m2x22mxy=a2m2b2

k2+m2h22mhk=a2m2b2

m2(h2a2)2mhk+b2+k2=0

b2+k2h2a2=c2

b2+y2=c2(x2a2)

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The point  of intersection  of  two tangents  to  the  hyperbola  x2a2−y2b2=1, the product of whose slopes is c2,  lies on the curve,