The acute angle between the lines vecr=(...

The acute angle between the lines `vecr=(4hati-hatj)+5(2hati+hatj-3hatk) and vecr=(hati-hatj+2hatk)+t(hati-3hatj+2hatk)` is (A) `(3pi)/2` (B) `pi/3` (C) `(2pi)/3` (D) `pi/6`

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