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The equation of tangent to hyperbola 4x^...

The equation of tangent to hyperbola `4x^2-5y^2=20` which is parallel to `x-y=2` is (a) `x-y+3=0` (b) `x-y+1=0` (c) `x-y=0` (d) `x-y-3=0`

A

`x-y-3=0`

B

`x-y+1=0`

C

`x-y+9=0`

D

`x-y+7=0`

Text Solution

Verified by Experts

The correct Answer is:
B
`y=mxpmsqrt(5m^(2)-4)`
m=1
`y=xpm1`
x-y+1=0
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