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120 lines
2.6 KiB
120 lines
2.6 KiB
7 years ago
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<title>Untitled</title>
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</head>
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<body>
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<math xmlns="http://www.w3.org/1998/Math/MathML">
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<mrow>
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<mi>k</mi>
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<mo>=</mo>
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<mfrac>
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<mrow>
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<mfrac>
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<mrow>
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<msup>
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<mo>∂</mo>
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<mn>2</mn>
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</msup>
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<mi>z</mi>
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</mrow>
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<mrow>
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<mo>∂</mo>
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<msup>
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<mi>x</mi>
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<mn>2</mn>
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</msup>
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</mrow>
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</mfrac>
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<mfrac>
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<mrow>
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<msup>
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<mo>∂</mo>
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<mn>2</mn>
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</msup>
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<mi>z</mi>
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</mrow>
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<mrow>
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<mo>∂</mo>
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<msup>
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<mi>y</mi>
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<mn>2</mn>
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</msup>
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</mrow>
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</mfrac>
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<mo>-</mo>
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<msup>
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<mrow>
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<mo>(</mo>
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<mfrac>
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<mrow>
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<msup>
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<mo>∂</mo>
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<mn>2</mn>
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</msup>
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<mi>z</mi>
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</mrow>
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<mrow>
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<mo>∂</mo>
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<mi>x</mi>
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<mo>∂</mo>
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<mi>y</mi>
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</mrow>
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</mfrac>
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<mo>)</mo>
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</mrow>
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<mn>2</mn>
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</msup>
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</mrow>
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<mrow>
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<msup>
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<mrow>
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<mo>(</mo>
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<mn>1</mn>
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<mo>+</mo>
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<msup>
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<mrow>
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<mo>(</mo>
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<mfrac>
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<mrow>
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<mo>∂</mo>
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<mi>z</mi>
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</mrow>
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<mrow>
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<mo>∂</mo>
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<mi>x</mi>
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</mrow>
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</mfrac>
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<mo>)</mo>
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</mrow>
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<mn>2</mn>
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</msup>
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<mo>+</mo>
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<msup>
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<mrow>
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<mo>(</mo>
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<mfrac>
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<mrow>
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<mo>∂</mo>
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<mi>z</mi>
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</mrow>
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<mrow>
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<mo>∂</mo>
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<mi>y</mi>
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</mrow>
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</mfrac>
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<mo>)</mo>
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</mrow>
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<mn>2</mn>
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</msup>
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<mo>)</mo>
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</mrow>
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<mn>2</mn>
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</msup>
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</mrow>
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</mfrac>
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</mrow>
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</math>
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</body>
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</html>
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