1.

Write the direction ratio's of the vector a= i+j-2k and hence calculateits direction cosines.

Answer»

Direction ratios are =

a = 1, b = 1, c = -2

Magnitude of a vector =

√(1²+1²+(-2)²

= √6

The direction cosines are

= (a/|a|, b/|a|, c/|a|)

= (1/√6, 1/√6, -2/√6)

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