1.

The direction cosine of the line joining (1, –1, 1) and (–1,1,1) are which of the following ?(A) (2, –2,0) (B) (1,–1,0)(C) (1/√2, -1/√2, 0)(D) None of these

Answer»

(C) (1/√2, -1/√2, 0)



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