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The angle between the pairs of lines vec...

The angle between the pairs of lines `vecr = 3hati + 2hatj - 4hatk + lambda (hati + 2hatj + 2hatk)` and `(vecr = 5hati - 2hatk + mu(3hati + 2hatj + 6hatk)` is :

A

`theta = sin^(-1)"" (19)/(21)`

B

`theta = cos^(-1) "" (22)/(21)`

C

`theta = cos^(-1)"" (19)/(20)`

D

`theta = cos^(-1) "" (19)/(21)`

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