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一、概念的引入,从常见的自然现象引入师:自然界有许多周而复始的现象,你能举出一些特殊的例子吗?生1:太阳的升起与落下,潮水的上升与下落,每个星期天的到来,候鸟的来到。师:你能说出例子中情况多久会重复一次呢?生1:太阳每天升起与落下,每个星期天的到来时七天,候鸟一年来一次。师:你能在我们数学中举出一些例子吗?生2:在学习正弦函数、余弦函数的三角函数线时发现有规律。
First, the concept of introduction, from the introduction of common natural phenomena Teacher: there are many natural phenomena in the world, can you give some special examples? Health 1: the rise and fall of the sun, the rise and fall of the tide, every Sunday The arrival of migratory birds. Teacher: Could you say how often the example will be repeated? Health 1: The sun rises and falls daily, seven days each Sunday, and the migratory bird once a year. Teacher: Can you give some examples in our math? Student 2: We found a regular pattern when learning trigonometric lines of sine and cosine functions.