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1.本单元知识点三角函数是基本初等函数,它是描述周期现象的重要数学模型.本单元的学习重点包括:三角函数的概念,三角函数的图象与性质,同角三角函数基本关系,三角函数诱导公式,两角和与差的正弦、余弦、正切公式,二倍角的正弦、余弦、正切公式,函数y=Asin(ωx+φ)的图象,三角函数模型的应用.本单元的学习难点包括:三角恒等变换.2.典型例题选讲例1已知tanα=13,求值:
1. The knowledge of this unit Trigonometric function is the basic elementary function, which is an important mathematic model to describe the periodic phenomenon.The learning focuses of this unit include: the concept of trigonometric function, the image and nature of trigonometric function, the basic relationship with the trigonometric function, Trigonometric function induces formulas for trigonometric functions of trigonometric functions of y = Asin (ωx + φ) using the sine, cosine, tangent, and tangent formulas with double sine, cosine, Learning difficulties include: triangular constant transformation .2 typical examples of selected cases 1 known tanα = 13, evaluation: