The direction ratios of two lines are $3, 2, - 6$ and $1, 2, 2$ respectively. The acute angle between these lines are

cos^{- 1} (\frac{5}{18})

cos^{- 1} (\frac{3}{20})

cos^{- 1} (\frac{5}{21})

cos^{- 1} (\frac{8}{21})

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The direction ratios of two lines are

3, 2, - 6

and

1, 2, 2

respectively. The acute angle between these lines are

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Question Text

The direction ratios of two lines are

3, 2, - 6

and

1, 2, 2

respectively. The acute angle between these lines are

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