LibreOffice Math is not having an options to save a math formula as svg/png/bmp or any other image file format or pdf. Does LibreOffice has any extensions or add-ins for this or are there any online/offline free applications for converting .odf to .svg/png, etc.
LibreOffice Math also has an option to save the math formula as a MathML file. So .mml to .svg/png, etc. conversion applications will also work.
From Math, you can Export as PDF…, then open the PDF with Draw. There you can export as SVG or PNG.
Tested with LibreOffice 6.4.7.2 (x86); OS: Windows 6.1.
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Copy formula.
Paste into Draw, Shape > Convert > To Curve. (This is enough to copy and paste into another application as PNG, or into Word as a vector, Paste special as Enhanced Metafile)
Or you can File >Export > SVG (tick box labelled Selection).
Paste into Draw,
Maybe better "menu Insert - Object - Formula…, then "