Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
Consider the following relations among the angles α, β and γ made by a vector with the coordinate axes.
I. cos 2α + cos 2β + cos 2γ = -1
II. sin2 α + sin2 β + sin2 γ = 1
Which of the above statement(s) is/are correct?
1
Only I
2
Only II
3
Both I and II
4
More than one of the above
5
None of the above