Q 1133667542.     If the line `y=2x+c` is a tangent to the circle `x^2+y^2=5`,then a value of `c` is :

EAMCET 2011
A

`2`

B

`3`

C

`4`

D

`5`

HINT

If the line `L_1=0` is a tangent to the circle, `c=asqrt(m^2+1).`

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