[postlink]https://7arivu.blogspot.com/2011/09/iit-jee-perpendicular-planes-part-1.html[/postlink]
http://www.youtube.com/watch?v=2u535-HVJ_o&feature=channel_video_title
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[starttext]
2010 IIT JEE Paper 1 #30 normal vector and planes (Part 1)
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