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[" 41.If the equations "y=mx+c" and "x c...

[" 41.If the equations "y=mx+c" and "x cos alpha+y sin alpha=p" represent the same straight line,then "],[[" (a) "p=c sqrt(1+m^(2))," (b) "c=p sqrt(1+m^(2))," (c) "cp=sqrt(1+m^(2))," (d) "p^(2)+c^(2)+m^(2)=1]]

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