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Was junior high school mathematics sinusoidal in the 1980s?
No, the mathematics content includes cubic and cubic difference formulas, the solution of complex equations and equations, four-point * * * circle, circle power theorem, etc., which are either downgraded to elective courses or deleted altogether. Logarithm, obtuse trigonometric function, sine theorem and cosine theorem, unary quadratic inequality, etc. , are high school.