<math xmlns='http://www.w3.org/1998/Math/MathML'><semantics><mrow xref='id23'><mrow xref='id21'><mrow xref='id7'><mi xref='id1'>x</mi><mo>⁢</mo><mfenced><mrow xref='id6'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id2'>x</mi></mrow></mfrac><mrow xref='id5'><mi xref='id3'>y</mi><mo>⁡</mo><mfenced><mi xref='id4'>x</mi></mfenced></mrow></mrow></mfenced></mrow><mo>+</mo><mrow xref='id20'><mfenced><mrow xref='id12'><mrow xref='id10'><msup><mi xref='id8'>x</mi><mn xref='id9'>2</mn></msup></mrow><mo>-</mo><mn xref='id11'>1</mn></mrow></mfenced><mo>⁢</mo><mfenced><mrow xref='id19'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id13'>x</mi></mrow></mfrac><mrow xref='id18'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id14'>x</mi></mrow></mfrac><mrow xref='id17'><mi xref='id15'>y</mi><mo>⁡</mo><mfenced><mi xref='id16'>x</mi></mfenced></mrow></mrow></mrow></mfenced></mrow></mrow><mo>=</mo><mn xref='id22'>0</mn></mrow><annotation-xml encoding='MathML-Content'><apply id='id23'><eq/><apply id='id21'><plus/><apply id='id7'><times/><ci id='id1'>x</ci><apply id='id6'><diff/><bvar><ci id='id2'>x</ci></bvar><apply id='id5'><ci id='id3'>y</ci><ci id='id4'>x</ci></apply></apply></apply><apply id='id20'><times/><apply id='id12'><minus/><apply id='id10'><power/><ci id='id8'>x</ci><cn id='id9' type='integer'>2</cn></apply><cn id='id11' type='integer'>1</cn></apply><apply id='id19'><diff/><bvar><ci id='id13'>x</ci></bvar><apply id='id18'><diff/><bvar><ci id='id14'>x</ci></bvar><apply id='id17'><ci id='id15'>y</ci><ci id='id16'>x</ci></apply></apply></apply></apply></apply><cn id='id22' type='integer'>0</cn></apply></annotation-xml><annotation encoding='Maple'>x*diff(y(x),x)+(x^2-1)*diff(diff(y(x),x),x) = 0</annotation></semantics></math>