What are the direction cosines of a line which is equally inclined to the positive directions of the axes?

\[\left\langle -\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]

\[\left\langle \frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]

\[\left\langle -\frac{1}{\sqrt{3}},-\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]

\[\left\langle \frac{1}{3},\frac{1}{3},\frac{1}{3} \right\rangle \]

What are the direction cosines of a line which is equally inclined to

1.	What are the direction cosines of a line which is equally inclined to the positive directions of the axes?
A.	\[\left\langle \frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]
B.	\[\left\langle -\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]
C.	\[\left\langle -\frac{1}{\sqrt{3}},-\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]
D.	\[\left\langle \frac{1}{3},\frac{1}{3},\frac{1}{3} \right\rangle \]
Answer» B. \[\left\langle -\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}} \right\rangle \]

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What are the direction cosines of a line which is equally inclined to the positive directions of the axes?

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