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

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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.

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SOLVED: The acute angle between intersecting lines that do not cross at right angles is the same as the angle determined by vectors normal to the lines or vectors parallel to the

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

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