Convergence Phenomenon with Fourier Series of <math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'>
<mrow>
<mi>t</mi><mi>g</mi><mrow><mo>(</mo>
<mrow>
<mfrac>
<mstyle mathvariant='bold' mathsize='normal'><mi>x</mi></mstyle>
<mn>2</mn>
</mfrac>
</mrow>
<mo>)</mo></mrow></mrow>
</math>
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