Find the angle between the following pair of lines (i) vec r = 2bar i - 5 hat j + hat k + lamda (3 hat i + 2 hat j

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Q 1805101068.     Find the angle between the following pair of lines

(i) vec r = 2bar i - 5 hat j + hat k + lamda (3 hat i + 2 hat j + 6 hat k)

and vec r = 7 hat i - 6 hat k + mu ( hat i + 2 hat j + 2 hat k).

(ii) vec r = 3bar i + hat j - 2 hat k + lamda ( hat i - hat j - 2 hat k)

and  vec r = 2 hat i - hat j - 5 hat k + mu (3 hat i - 5 hat j - 4 hat k)`

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