论文部分内容阅读
有幸拜读贵刊文[1],了解到关于特殊三角函数值的一种速记口诀,简略陈述如下:一二三三二一,戴上根号对半劈.两边根号三,中间竖旗杆.分清是增减,试把分母安.正首余末三,好记又简单.零度九十度,斜线Z形连.端点均为零,余下竖横填.洋洋洒洒的六行诗,不足百字,句子还基本押韵,让人叹为观止.但感叹之余,笔者又生忧虑,口诀虽简,但将近500余字的注释,足见该口诀之晦涩难懂,这无疑使得真正记忆与理解起来难上加难,增加了学生负担!现在,笔者给出另外两种特殊三角函数值速记方法,供参考.
I was privileged to read your article [1] and learn about a short-handed statement about the value of a particular trigonometric function. The brief statement is as follows: 1323332, put on a pair of roots and a pair of roots. Separation is the increase and decrease, try to put the denominator security. The first is the end of the third, easy to remember and simple. Zero degree ninety degrees, slash Z-link. End points are zero, the remaining vertical and horizontal fill. Oceans and six lines of poetry, less than one hundred Words and sentences are also basic rhymes, which make people wonder. But when sighing, the author feels anxious and his mouth is simple, but his nearly 500-character commentary indicates that the mouth is obscure and obscure. This undoubtedly makes it difficult to truly remember and understand. The hardships increase the burden on students! Now, the author gives two other special trigonometric shorthand methods for reference.