If \( y=2 \) is directrix and \( (0,1) \) be the vertex of parabola \( x^{2}+ \) \( \lambda y+\m...
If \( y=2 \) is directrix and \( (0,1) \) be the vertex of parabola \( x^{2}+ \) \( \lambda y+\mu=0 \) then; \( (\lambda-\mu)= \) ?
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