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If aplha, beta, gamma are the directiona...

If `aplha, beta, gamma` are the directional angles of a vector then `sin^(2)aplha + sin^(2) beta+sin^(2) gamma`.

A

2

B

-2

C

1

D

0

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Let vecr=xveci+yvecj+zveck be the position vector of any point and let alpha,beta,gamma be the direction angle of vecr then sin^(2)alpha+sin^(2)beta+sin^(2)gamma is:

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    `-1 ` but not 1
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