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11 lines
194 B
Plaintext
11 lines
194 B
Plaintext
<math display="block">
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<mrow>
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<msub>
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<mo>∬</mo>
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<mi>D</mi>
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</msub>
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<mi>d</mi><mi>x</mi>
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<mspace width="thinmathspace"/>
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<mi>d</mi><mi>y</mi>
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</mrow>
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</math> |