If the equations y = mx + c and x cos alpha + y sin alpha = p represent the same straight line, then
(a) p=c√1+m²
(b)c = p√1+m²
(c) cp = √1 + m²
(d) 1
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In these type of questions, compare the coefficients of x and y . As both equations represent same locus, all points satisfying one will satisfy other equation also.
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