state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
lf a line makes angles α, β, γ with OX, OY, OZ respectively where O = (0, 0, 0), then cos2α + cos2β + cos2γ is
1
-1
2
1
3
2
4
0
5
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