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(B) The direction cosines of a line are denoted by $l, m, n$. We know that for any line,the sum of the squares of its direction cosines is always equa

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$\pm \sqrt{3}$

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(B) The direction cosines of a line are denoted by $l, m, n$. We know that for any line,the sum of the squares of its direction cosines is always equal to $1$,i.e.,$l^2 + m^2 + n^2 = 1$. Given the direction cosines are $\left(\frac{1}{c}, \frac{1}{c}, \frac{1}{c}\right)$. Substituting these values into the identity: $\left(\frac{1}{c}\right)^2 + \left(\frac{1}{c}\right)^2 + \left(\frac{1}{c}\right)^2 = 1$ $\frac{1}{c^2} + \frac{1}{c^2} + \frac{1}{c^2} = 1$ $\frac{3}{c^2} = 1$ $c^2 = 3$ $c = \pm \sqrt{3}$

If the direction cosines of a straight line are $\left(\frac{1}{c}, \frac{1}{c}, \frac{1}{c}\right)$,then $c$ is equal to

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