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If O is the origin and the coordinates o...

If `O` is the origin and the coordinates of `A` are `(a ,b , c)` . Find the direction cosines of `O A` and the equation of the plane through `A` at right angles to OA.

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`DC' s are (a)/(sqrt(a ^(2) + b ^(2) + c ^(2))), (b)/(sqrt(a ^(2) + b ^(2) + c ^(2))), (c)/(sqrt(a ^(2) + b ^(2) + c ^(2))), ax + by + cz =a^(2) +b ^(2) + c ^(2)`
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