Find the angle between the lines `vecr = 3hati - 2hatj + 6hatk + lamda(2hati + hatj + 2hatk)` and `vecr = (2hatj - 5h

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Q 1769156915.     Find the angle between the lines

`vecr = 3hati - 2hatj + 6hatk + lamda(2hati + hatj + 2hatk)` and `vecr = (2hatj - 5hatk) + mu(6hati + 3hatj + 2hatk)`.

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