[complex_and_trig] Enforce mathjax output

[HumphreyYang]

Hi @mmcky,

This PR resolves #351.

For some reason, I have to enforce mathjax output in init_printing to get sympy printing in latex.

It should print in latex automatically if it detects latex in the environment.

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[mmcky]

thanks @HumphreyYang -- looks like this solution will work in the LaTeX domain as well.

[mmcky]

@HumphreyYang it looks like the cache.yml environment doesn't include latex which is likely causing this issue.

Let's put this on hold until:

• add latex to the cache workflow
• see if this issue remains

[mmcky]

@HumphreyYang I will merge this for now (in this merge window) but I don't think we will ultimately need it due to #356

I will open an issue to remove after some testing.