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<math>z = r^\frac{1}{n} \cdot \operatorname{cis}\tfrac{\varphi}{n}</math>

The first divisor ''n'' seems to be shown in the same font-size like the base ''r''. Expected representation: ''n'' should use 70% of the ''r''. Writing <math>z = r^{\frac{1}{n}} ...</math> gives no other result. (I know that MathML is sensitive to omitted braces.)

Environment: de-Wikibooks - user preferences: rendering with MathML and SVG/PNG - Windows 7 Home Premium SP1 with Firefox 32.0.3