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∫ f ( x ) ⅆ x
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<math> <mstyle displaystyle='true'> <mo>∫</mo> <mi>f</mi> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> <mtext> </mtext> <mo>ⅆ</mo> <mi>x</mi> </mstyle> </math>