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用Excel演示,当角很小时,弧度制下的角、该角的正弦值、该角的正切值三者是一致的

  • 2026-05-30 19:58:59
用Excel演示,当角很小时,弧度制下的角、该角的正弦值、该角的正切值三者是一致的
同学们，大家好。
有些物理题中会提及：“当角度很小的时候，这个角（弧度制下的值）、这个的正弦值、这个角的正切值是十分近似的”。
这个东西呢，传统的讲法是用单位圆之类的，但我感觉不是特别好理解。这里用Excel做了一个表格，把相应的值都列在这里，希望能帮同学们对此问题有一个感性的认识。
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尊敬的读者，您好。我一个人用了8年时间将物理高考题从头到尾一题不落地做了一遍，并将1977-2022年的3692道高考真题分成了857个小类（思维导图），现已整理成册出版了，欢迎大家选购，当当，京东自营均有售。

如果您是教师，更建议您买一套，您不妨建议学校的领导给学科组的老师一人买一套。您讲完书上的一节之后，是不是想知道截止到这一节，高考都考过什么？就我的调研，只有我这一本书系统地回答了上述问题。您在使用过程中发现什么问题或者有好的建议，也请您告诉我，谢谢。

《高考物理真题分类汇编：1977-2024（上）》试读
《高考物理真题分类汇编：1977-2024（下）》试读
作者：尔昕悦
中国科学技术出版社 2024年9月、2025年2月出版
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  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001112s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001258s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004247s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001148s ]
  6. SELECT * FROM `set` [ RunTime:0.000502s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001208s ]
  8. SELECT * FROM `article` WHERE `id` = 523914 LIMIT 1 [ RunTime:0.001637s ]
  9. UPDATE `article` SET `lasttime` = 1780311655 WHERE `id` = 523914 [ RunTime:0.006608s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 523914 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000495s ]
  12. SELECT * FROM `article` WHERE `id` > 523914 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004795s ]
  13. SELECT * FROM `article` WHERE `id` < 523914 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013718s ]
  14. SELECT * FROM `article` WHERE `id` < 523914 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007816s ]
  15. SELECT * FROM `article` WHERE `id` < 523914 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002608s ]
0.185765s