My latexrender (installed by my wife with much pain) has gone to disuse. So I’m putting up this problem posted by pAt84.

Version 1

[tex]\mbox{\Large \mu = \int_0^1 \frac{ \big( \sum_{j=0}^n a_j t^j \big) \big( \sum_{i=1}^n i b_i t^i \big) } { \sqrt{\big( \sum_{j=1}^n j a_j t^j \big) ^2 + \big( \sum_{i=1}^n i b_i t^i \big)^2 }} dt}[/tex]

Version 2

[tex]\mbox{\Large \mu = \int \frac{p(x) q\prime (x)}{ \sqrt{ p\prime (x)^2 + q \prime (x)^2} } dx}[/tex]

Thank you.