The answer is D) 30o,45oWe know that for a vector, cos2a + cos2b + cos2c = 1 , (where a,b,c are the angles made by the vector from positive x,y,z axis resp.)or cos2a + cos2b = sin2cNow, 0 2c 2a + cos2b This condition is followed by every given set except the D) one.Hence, that is your answer.

Grade 12th passVectors

ALTSM 22/03 Q91

ANMOL SETH

11 Years agoGrade 12th pass

1 Answer

Yash Jain

11 Years ago

The answer is D) 30^o,45^o
We know that for a vector, cos²a + cos²b + cos²c = 1 , (where a,b,c are the angles made by the vector from positive x,y,z axis resp.)
or cos²a + cos²b = sin²c
Now, 0 ²c ²a + cos²b
This condition is followed by every given set except the D) one.
Hence, that is your answer.