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If the chord y=mx+1, of the circle x^2+y...

If the chord `y=mx+1`, of the circle `x^2+y^2=1` subtends an angle of measure `45 °` of the major segment of the circle then value of `m` is
(1)   `2`       (2)   `2`      
(3)   `-1`       (4)   None of these      

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