Taught it for many years. Partly it acts as a weedout course. Partly that many high school algebra courses are too weak. Partly forgetting.
Replying to @St_Rev @rishmishra
A bright student takes it in 9th grade then skates on further math classes until 2nd year of college, they forget everything.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.