How to determine the direction cosines of the normal to the plane and the distance from the origin

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1. In each of the following cases, determine the direction cosines of the normal to the plane and the distance from the origin.
(a) z = 2 (b) x + y + z = 1
(c) 2x + 3y – z = 5 (d) 5y + 8 = 0
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sir..thank you... par aisa lagta hai aap kaafi peete ho, awaaz se lagta tha.. :P thank you :) sir.

amanaloon