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必修4(人教版)第三章《三角恒等变换》凸现了三角函数的工具性作用,教材以两角和与差的正弦、余弦、正切公式为三角变换的基本依据,通过对这些公式的探求,导出倍角公式、半角公式,再利用这些公式进行三角变换,涉及到三角函数式的化简、求值、证明等问题.三角函数式的求值问题是三角恒等变换的核心内容,对三角函数式的求值问题,教材以例题、练习、习题、复习参考题等不同形式呈现,层次分明,层层递进,螺旋式上升,给了教师灵活处理教
Compulsory 4 (PEP) Chapter III “triangular identity transform” highlights the trigonometric function of the instrumental textbook with two corners and the difference of sine, cosine, tangent formula for the basic basis for triangular transformation, through these formulas The derivation of multiplier formula and half-angle formula, and then use these formulas to carry out the triangular transformation involves the simplification, evaluation and proving of trigonometric functions, etc. The evaluation of trigonometric functions is the core content of triangular identity transformation, Evaluation of the trigonometric function, teaching materials to examples, exercises, exercises, review reference questions and other forms of presentation, structured, progressive layers, spiraling, giving teachers flexible treatment