Show that four points (0,-1,-1) (4,5,1) (3,9,4) (-4,4,4) are coplanar. Also find the equation of the plane containing them.
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https://www.meritnation.com/ask-answer/question/show-that-the-points-0-1-1-4-5-1-3-9-4-and-4-4-4/three-dimensional-geometry/1778790