1.

If the angle between the circle x^2+y^2-2x-4y+c=0 and x^2+y^2-4x-2y+4=0 is 60^@, then C is equal to

Answer»

`(3pmsqrt5)/2`
`(6pmsqrt5)/2`
`(9pmsqrt5)/2`
`(7pmsqrt5)/2`

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