If the chord \( y=m x+1 \) of the circles \( x^{2}+y^{2}=1 \) subte...

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If the chord \( y=m x+1 \) of the circles \( x^{2}+y^{2}=1 \) subtends
P an angle of \( 45^{\circ} \) at the major segment of the circle, then the

W value of \( m \) is
(1) 2
(2) -2
(3) -1
(4) none of these
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