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Choose the correct option.
If the direction cosines of a line are then (Understanding)
If the direction cosines of a line are $\left\langle \frac{1}{c}, \frac{1}{c}, \frac{1}{c} \right\rangle$ then (Understanding)
- (a)$c > 0$
- (b)$0 < c < 1$
- (c)$c = \pm\sqrt{3}$
- (d)$c > 2$
Answer
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From ISC 2026 Specimen Mathematics Paper 1, question 15(iii).
Check your working with the 3D geometry and vectors calculator: points, vectors, lines and planes: distances, angles, foot and image, shortest distance, intersections.