If the vector î − bĵ + k̂ is equally inclined to the coordinate axes, then the value of b is :

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MCQ (Single)Direction Cosines and Direction Ratios of a VectorCBSE PYQ

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Assertion (A): If a line makes angles α, β, γ with positive direction of the coordinate axes, then sin² α + sin² β + sin² γ = 2. Reason (R): The sum of squares of the direction cosines of a line is 1.

Assertion-ReasonDirection Cosines and Direction Ratios of a VectorDirection Cosines of a Line

If the direction cosines of a line are (1/a, 1/a, 1/a), then :

MCQ (Single)