i have a problem about htmlawed

i use CKeditor plugin and i add a functionality, Math formula . but HTMLawed prevent the math formula to be displayed , how to fix this . ?

Note: I use MathML (https://www.w3.org/1998/Math/MathML/) to make Math Formula , i can't make exception in the HTMLawed, because MathML tags is so many , the tags are like this

<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>21</mn></mfrac></math&gt;

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