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in Vector algebra by (55.1k points)

If the shortest distance between lines vector r = i + 2j + 3k + λ1(2i + 3j + 4k) and vector r = 2i + 4j + 5k + λ2(3i + 4j + 5k) is x, then cos-1cos6x is equal to

(A) 1/2

(B) 0

(C) 1

(D) π

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