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CBSE Class 12 Mathematics 2026 Main Paper 65/2/3 · Q11 Marksdirection_cosines

CBSE Class 12 Mathematics 2026 Main Paper 65/2/3 · Question 1 (Three Dimensional Geometry)

Which listed direction cosines belong to the line x=1, y=z? The printed symmetric form is (1−x)/0=y=z.

(A) (1,1,1)
(B) (0,−1/√2,−1/√2)
(C) (1,0,0)
(D) (0,−1,−1)

✅ Step-by-Step Solution

Final Answer: (0,−1/√2,−1/√2)

The direction vector (0,1,1) has norm √2. Reversing its orientation gives the listed direction cosines (0,−1/√2,−1/√2).

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All Questions in CBSE Class 12 Mathematics 2026 Main Paper 65/2/3

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