All right, I can concede that in higher math, the use of tau doesn't greatly impact anything (although it still does). The point though, is that pi is fundamentally incorrect as the so-called circle constant. Furthermore, the use of tau would significantly change teaching. Trigonometry and radians would become so, so much easier to grasp. For example: sin 2t. Well, that's 2 revolutions of a circle, which means we're back where we started. Hence, 0. Logically sound: it's much easier for a student to grasp that t=1 revolution than 2pi=1 revolution