Trigonometry mastery is a good thing (as a form of mental calisthenics, and for
it's theoretical value, and to prepare kids for more advanced math). But
what percentage of Americans really use sines, cosines, tangents and cotangents
it in their daily jobs?It's a great and fun subject (I loved
it), but I don't think we need to label any kids who don't get to it
in high school as "failures". I'm sure there's adults who
use them regularly... but I'm pretty sure it's not the majority of
adults who use them every day, or even use them at all after leaving school.
But I may be wrong.