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Find the range of values of m for which ...

Find the range of values of `m` for which the line `y=m x+2` cuts the circle `x^2+y^2=1` at distinct or coincident points.

A

`( - oo, - sqrt( 3)] uu [ sqrt( 3) ,+oo)`

B

`[ - sqrt( 3) , sqrt( 3) ]`

C

`[ sqrt( 3) , + oo)`

D

None of these

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