fixed formatting bugs in makeFurtherVector

Specifically, I’ve switched to bold face for the vectors (consistent with the other questions) and tidied up a misplaced comma that I introduced.

Unit tests updated appropriately.
fixed make matrix transformations mathmo questions

The problem was the use of `-sines[a]` and `-cosines[a]`, which were returning NaN errors.

I’ve introduced objects acosines[] and asines[] which should do exactly what we want, but don’t break this way.
switch to pmatrix environment for matrices

Unit tests updated also.