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MyWikiBiz, Author Your Legacy — Monday September 08, 2025
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spacing
Line 7,995: Line 7,995:  
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<p><math>\operatorname{d}^2 f = </math></p>
 
<p><math>\operatorname{d}^2 f = </math></p>
<p><math>\partial_{xy} f \cdot \operatorname{d}x\ \operatorname{d}y</math></p>
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<p><math>\partial_{xy} f \cdot \operatorname{d}x\, \operatorname{d}y</math></p>
| <math>\operatorname{d}f|_{x\ y}\!</math>
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| <math>\operatorname{d}f|_{x\, y}\!</math>
| <math>\operatorname{d}f|_{x\ (y)}\!</math>
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| <math>\operatorname{d}f|_{x\, (y)}\!</math>
| <math>\operatorname{d}f|_{(x)\ y}\!</math>
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| <math>\operatorname{d}f|_{(x)\, y}\!</math>
 
| <math>\operatorname{d}f|_{(x)(y)}\!</math>
 
| <math>\operatorname{d}f|_{(x)(y)}\!</math>
 
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