triangular rule造句

created article Triangular rule which appears to be at best non-notable and probably a hoax.
It is currently at AFD : Wikipedia : Articles for deletion / Triangular rule . was created today, and their first edit was to ! vote keep at the AFD on the grounds that their " calculus professor in college used this rule " although it does not always yield an " underestimation ", an unusual word previously used by ZariakAC in the article.
It's difficult to find triangular rule in a sentence. 用triangular rule造句挺难的