Three Dimensional Geometry
Two lines in 3-D are x=ay+b,z=cy+d and x=a′z+b′,y=c′x+d′ are perpendicular to each other then which of the following condition is true? (a) aa′+c+c′=0 (b) cc′+a+a′=0 (c) aa′+cc′=0 (d) aa′+cc′+1=0
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