Test typexo
This is a new line online.
$$
\dfrac {\sum _ {i = 1} ^ \infty \dfrac {1} {i ^ 3}} {\int _ a ^ b x ^ 2 \mathrm dx}
$$
This is a new line offline.
test warning
#include <cstdio>
int main()
{
printf("Hello World!\n");
return 0;
}