Three Dimensional Geometry Question 143
Question: If a line makes $ \alpha ,\beta ,\gamma $ with the positive direction of $ x,\ y $ and z-axis respectively. Then, $ {{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma $ is
[Orissa JEE 2002]
Options:
A) ½
B) ?1/2
C) ?1
D) 1
Show Answer
Answer:
Correct Answer: D
Solution:
It is obvious.
BETA
