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The plane 2x−2y+z=3 is rotated about the line where it cuts the xy−plane by an acute angle α. If the new position of plane contains the point (3,1,1) then 9cosα is equal to

Answer» The plane 2x−2y+z=3 is rotated about the line where it cuts the xy−plane by an acute angle α. If the new position of plane contains the point (3,1,1) then 9cosα is equal to


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