Q. 3
Find the direction cosines of the normal to the plane y = 3.
Answer :
Given :
Equation of plane : y = 3
To Find : Direction cosines of the normal i.e. 
Formula :
1) Direction cosines :
If a, b & c are direction ratios of the vector then its direction cosines are given by
Answer :
For the given equation of plane
y = 3
Direction ratios of normal vector are (0, 1, 0)
= 1
Therefore, direction cosines are
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