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This formula was troublesome on Apple devices with iOS 11 when Text Size large option in another thread. I've noticed the same problem here once, but apparently it's gone. On the other page the problem persist with Text Size large option.

$\frac{\pi}{8} \approx \frac{1}{1\cdot 3} + \frac{1}{5\cdot 7 } + \frac{1}{9\cdot 11} +\frac{1}{13\cdot15}+\cdots+\frac{1}{\left ( 4n-3 \right )\left ( 4n-1 \right )} +\frac{1}{16n+\frac{1}{n+\frac{4}{16n+\frac{9}{n+\frac{16}{\ddots +\frac{\ddots}{\ddots+\frac{n^{2}}{n\left [ 16-15\left ( n\bmod 2\right ) \right ]}}}}}}}$

$\frac{\pi}{8} \approx \frac{1}{1\cdot 3} + \frac{1}{5\cdot 7 } + \frac{1}{9\cdot 11} +\frac{1}{13\cdot15}+\cdots+\frac{1}{\left ( 4n-3 \right )\left ( 4n-1 \right )} +\frac{1}{16n+\frac{1}{n+\frac{4}{16n+\frac{9}{n+\frac{16}{\vdots +\frac{\vdots}{\vdots+\frac{n^{2}}{n\left [ 16-15\left ( n\bmod 2\right ) \right ]}}}}}}}$

——

$$\rm{e}^{\sqrt{\sqrt{\frac{170-\frac{1}{1235\sqrt[3]{2}}}{99}}}}$$

$$\rm{e}^{\sqrt[4]{\frac{{1}^{2}+{13}^{2}-\frac{1}{{20}^{2}+{34}^{2}+\frac{1}{{20}^{2}}}}{99}}}$$
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