My only take on high school math is fuck trigonometry — people who get to complex numbers can treat all of trig as a mildly interesting corollary, essentially no one else needs to know it.
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I don't mean you learn about complex numbers in trig. I mean you learn about them later, unrelatedly, and after you do about 90% of trig is completely trivial. So you should just learn them first and avoid the pain of learning trig the hard way.
Trig functions and identities are only essential for intro calc because people want to teach the derivatives/integrals of trig functions which requires rote memorization. You don't need to do that! Again, just wait until you have learned about complex numbers and it's trivial.