I just mean that if I'm trying to write a script and I want to reduce all of the powers of cos or sin, I'm not sure how I would code that, because I can't tell if there's a pattern of which calls need to be made in which order to reduce an arbitrary polynomial of trig functions. For my present purpose, I'm doing the analysis interactively, so a little trial-and-error is fine. For future projects I'm trying to get a clearer understanding of how these functions work. So for example, why does TR7(cos(x)**7) just return cos(x)**7?
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