How to find acute angle between two intersecting lines in vector form?

When two lines intersect we can determine the acute angle by using the formula of cosine θ equal to scalar product of two vectors divided by product of their length.

Angle Between Two Lines - Formula, Examples, tan, cos

Angle Between Two Planes: Introduction, Formulas, Videos and Examples

How do you find the acute angle between two intersecting lines whos equations are given in vector form?

Lesson Explainer: The Angle between Two Planes and between a Plane and a Straight Line

Three Dimensional Geometry, PDF, Line (Geometry)

Angle Between Two Vectors - Formula, How to Find?

Vector Equations

What is the angle between two lines when they intersect at origin and one of the line is (2, 3) and the other line is (-3,6)? - Quora

If you have the parametric equations of two lines in three space, how can you find the angle between them (assuming they are not parallel)? - Quora

Angle Between Two Planes - Formula, Vector Form, Examples, Cartesian Form, FAQs

Angle Between Two Planes (Definition, Formulas & Examples)

Lesson Explainer: The Angle between Two Planes and between a Plane and a Straight Line