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<div>
The infinite sum
<math display="inline">
<mrow>
<munderover>
<mo></mo>
<mrow>
<mi>n</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mrow>
<mo>+</mo>
<mn></mn>
</mrow>
</munderover>
<mfrac>
<mn>1</mn>
<msup>
<mi>n</mi>
<mn>2</mn>
</msup>
</mfrac>
</mrow>
</math>
<br />
Is equal to the real number
<math display="inline">
<mfrac>
<msup>
<mi>π</mi>
<mn>2</mn>
</msup>
<mn>6</mn>
</mfrac>
</math>
</div>