This is a beta course, so its structure, chapters, and examples may continue to change.三角函数 This article is being translated. Please check back soon. Chapters三角函数的起源与发现Angles and RadiansSine FunctionCosine FunctionTangent FunctionCotangent FunctionSecant FunctionCosecant FunctionPower Trigonometric FunctionsPower Reduction FormulasPreviousLogarithmic FunctionsDetailed explanation of the definition, properties, graphs, and typical exercises of logarithmic functions.Next三角函数的起源与发现通过故事化场景，带领读者从实际问题出发，探索三角函数的诞生与应用。
