Eric Nicholas K's answer to angelina's Junior College 1 H2 Maths Singapore question.
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The vector projection of 3a - b onto a - 3b is the one I labelled in red on the left hand side.
But the length of that projection is a scalar (length is a scalar, independent of the direction). So using the scalar projection formula is sufficient for this question.
But the length of that projection is a scalar (length is a scalar, independent of the direction). So using the scalar projection formula is sufficient for this question.
Date Posted:
5 years ago
I mean the one I labelled in red without the arrow. The one which I wrote 'length of projection'.
Also, cos 60 = half.
Also, cos 60 = half.
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