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If y=m1x+c and y=m2x+c are two tangent...

If `y=m_1x+c` and `y=m_2x+c` are two tangents to the parabola `y^2+4a(x+a)=0` , then (a)`m_1+m_2=0` (b) `1+m_1+m_2=0` (c)`m_1m_2-1=0` (d) `1+m_1m_2=0`

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