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Choose the correct option.
If the direction cosines of a line are then
If the direction cosines of a line are $\left\langle \frac{1}{c}, \frac{1}{c}, \frac{1}{c} \right\rangle$ then
- (a)c > 0
- (b)0 < c < 1
- (c)c = ±3
- (d)c > 2
Answer
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From ISC 2025 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.