Series 7: Shear shear
A shear with scale factor X2 is applied to a T-shape, and a shear with scale factor X3 and the same invariant line is applied to the image.
Find the scale factor of the resultant shear.
[Two movies are provided for each pair of shears: one just shows the shears, the other also traces the path of salient points (as below).]
Shear shear (A)

Here the invariant line is at 45˚ to the horizontal.

Shear shear (B)

Here the invariant line has a less simple slope.

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