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妙用三角公式强化思维洲练３１３２０２浙江德清武康高级中学邱林甫高中代数上册第三章“两角和与差的三角函数”的特点是公式多，变形灵活，各公式之间有着千丝万缕的关系．如何使学生掌握这众多的公式，通常的方法是加强“练”与贯彻”熟”，达到熟练生巧．然而，我认为...
Magical use of triangular formula to strengthen the thinking Island training 313202 Zhejiang Deqing Wukang high school Qiu Linxuan high school algebra on the volume of the third chapter “two-corner and difference trigonometric function” is characterized by many formulas, flexible deformation, the formulas are inextricably linked . How to enable students to master these numerous formulas, the usual method is to strengthen the “training” and implementation of “familiar” to achieve skilled workmanship. However, I think...