data/mathematical/12.mml
<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><semantics><mrow><mi>θ</mi><mo>=</mo><mi>n</mi><mo>×</mo><msup><mn>137.508</mn> <mo>∘</mo></msup></mrow><annotation encoding='application/x-tex'>\theta = n \times 137.508^\circ</annotation></semantics></math>