Under what condition do \[\left\langle \frac{1}{\sqrt{2}},\frac{1}{2},k \right\rangle \] represent direction cosines of a line?

Under what condition do \[\left\langle \frac{1}{\sqrt{2}},\frac{1}{2},

1.	Under what condition do \[\left\langle \frac{1}{\sqrt{2}},\frac{1}{2},k \right\rangle \] represent direction cosines of a line?
A.	\[k=\frac{1}{2}\]
B.	\[k=-\frac{1}{2}\]
C.	\[k=\pm \frac{1}{2}\]
D.	K can take any value
Answer» D. K can take any value

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Under what condition do \[\left\langle \frac{1}{\sqrt{2}},\frac{1}{2},k \right\rangle \] represent direction cosines of a line?

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