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Bootstrap collapse

These are examples of using default bootstrap html css and js collapse. The only modification from the bootstrap documentation is that panel headings can't use <a> tags.

collapsible box 1 that has the class="panel-collapse collapse in" with the "in" causing this box to be open by default
collapsible box 2
Wiki syntax within HTML wrapper. End the HMTL, start wiki syntax, then finish your HTML.

This is a hidden panel
This is a hidden panel 2 with wiki syntax

When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$