Part of the confusion is that there does not appear to be a uniform standard. Our GT Pre-Calculus course is supposed to be a hodge-podge that includes function theory (with trigonometric functions as one example), some analytic geometry topics, some "advanced" algebra topics, and some linear algebra topics. Our AP Calculus BC course is focused on multi-variable calculus. Of course, things can change within the next few years as well. I know there was a recent reshuffling of topics for Algebra I in our district.