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<math> <msubsup> <mo>∫</mo> <mn>0</mn> <mn>1</mn> </msubsup> <mo>+</mo> <msubsup> <mfrac> <mi>x</mi> <mi>y</mi> </mfrac> <mn>0</mn> <mi>a</mi> </msubsup> <mo>+</mo> <msubsup> <mfrac> <mi>x</mi> <mi>y</mi> </mfrac> <mn>0</mn> <mn>1</mn> </msubsup> <mo>+</mo> <mstyle displaystyle='true'> <msubsup> <mo>∫</mo> <mn>0</mn> <mi>a</mi> </msubsup> </mstyle> </math>