This is the formula differentiating a function in MathML.
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<p>The derivative of the function <math><mi>f</mi></math> at <math><mi>x</mi></math> is</p>
<math display="block">
<mfrac><mrow><mi>d</mi><mi>f</mi><mtext>(</mtext><mi>x</mi><mtext>)</mtext></mrow><mrow><mi>d</mi><mi>x</mi></mrow></mfrac>
<mo>=</mo>
<munder><mrow><mtext>lim</mtext></mrow><mrow><mi>d</mi><mi>x</mi><mo>→</mo><mn>0</mn></mrow></munder>
<mfrac><mrow><mi>f</mi><mtext>(</mtext><mi>x</mi><mo>+</mo><mi>d</mi><mi>x</mi><mtext>)</mtext>
<mo>-</mo><mi>f</mi><mtext>(</mtext><mi>x</mi><mtext>)</mtext></mrow>
<mrow><mi>d</mi><mi>x</mi></mrow></mfrac>
</math>
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