论文部分内容阅读
一、问题的提出三角函数的学习是在高一的上半学期.许多学生对任意角的三角函数的定义普遍感到难以接受.因为初中研究的范围内角的正弦,余弦,正切值都是正数.教师反复强调要注意函数值的正负,学生也花很大的精力去记忆,当他们终于能稍稍熟练于频繁出现的正余弦求值时,三角函数的诱导公式这一节又将他们刚刚建立起来的信心彻底击垮,因为公式太多了,死记硬背再也跟不上老师的进度.为什么会出现这种情况呢?
First, the problem raised Triangle function learning is in the first semester of the high one. Many students generally feel the definition of trigonometric functions at any angle is unacceptable because the sine, cosine, tangent values of the angles within the scope of junior high school studies are positive. The teacher repeatedly emphasizes the importance of noting the positive and negative values of the function, and the students also devote a great deal of effort to remembering. When they finally become somewhat familiar with the frequent cosine and cosine evaluations, the trigonometric function’s induction formula again sets them up The confidence that comes together completely defeats, because the formula is too much, rote memorize can not keep up with the progress of the teacher again. Why does this happen?