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Commit 9590c7d4 authored by Claude Meny's avatar Claude Meny
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Update cheatsheet.fr.md

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    12.temporary_ins/69.waves/30.n3/20.overview/cheatsheet.fr.md
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    ......@@ -1084,20 +1084,20 @@ commenter
    ![](sum-two-plane-wave-progressive-monochrome-complex-representation-3_L1200.jpg)
    $\mathbf{A = \|\overrightarrow{U}\| =
    $`\mathbf{A = \|\overrightarrow{U}\| =
    \sqrt{\overrightarrow{U}\cdot\overrightarrow{U}}
    =
    \sqrt{\big(\overrightarrow{U}_1 + \overrightarrow{U}_2\big)\cdot\big(\overrightarrow{U}_1 + \overrightarrow{U}_2\big)}}$
    \sqrt{\big(\overrightarrow{U}_1 + \overrightarrow{U}_2\big)\cdot\big(\overrightarrow{U}_1 + \overrightarrow{U}_2\big)}}`$
    $\mathbf{ =
    \sqrt{\overrightarrow{U}_1\cdot\overrightarrow{U}_1 + \overrightarrow{U}_2\cdot\overrightarrow{U}_2+2\;\overrightarrow{U}_1\cdot\overrightarrow{U}_2}}$
    $`\mathbf{ =
    \sqrt{\overrightarrow{U}_1\cdot\overrightarrow{U}_1 + \overrightarrow{U}_2\cdot\overrightarrow{U}_2+2\;\overrightarrow{U}_1\cdot\overrightarrow{U}_2}}`$
    $\mathbf{ =
    \sqrt{\|\overrightarrow{U}_1\|^2+ \|\overrightarrow{U}_2\|^2+2\;\|\overrightarrow{U}_1\|\;\|\overrightarrow{U}_2\|\;cos\Big(\widehat{\overrightarrow{U}_1,\overrightarrow{U}_2}\Big)}}$
    $`\mathbf{ =
    \sqrt{\|\overrightarrow{U}_1\|^2+ \|\overrightarrow{U}_2\|^2+2\;\|\overrightarrow{U}_1\|\;\|\overrightarrow{U}_2\|\;cos\Big(\widehat{\overrightarrow{U}_1,\overrightarrow{U}_2}\Big)}}`$
    $\mathbf{ =
    $`\mathbf{ =
    \sqrt{A_1^2\;+\;A_2^2\;+\;
    2 \;A_1\,A_2\;cos(\varphi_2-\varphi_1)}}$
    2 \;A_1\,A_2\;cos(\varphi_2-\varphi_1)}}`$
    <br>
    ......
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