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Q.

The equation of a tangent to the hyperbola

4x25y2=20 parallel to the line xy=2 is

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a

xy3=0

b

xy+9=0

c

xy+1=0

d

xy+7=0

answer is C.

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Detailed Solution

a2=5,b2=4 slope of tangent=1 equation of tangent is y=mx±a2m2-b2 y=x±1

 

 

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