Math miscellaneousEasy
Question
The two lines x = ay + b, z = cy + d and x = a′y + b′, z = c′y + d′ will be perpendicular, if and only if
Options
A.aa′ + bb′ + cc′ + 1 = 0
B.aa′ + bb′ + cc′ = 0
C.(a + a′) (b + b′) + (c + c′) = 0
D.aa′ + cc′ + 1 = 0
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