Discuz Math Forum»Forum › Mathematics › High School › 三锐角余弦平方和为1

Return to list New

View 1728|Reply 1

[函数] 三锐角余弦平方和为1

[Copy link]

187 Threads	206 Posts	2155 Credits

Credits: 2155

Send PM

guanmo1 Posted 2018-2-23 12:19 |Read mode

三锐角余弦平方和为1.JPG

Reply Edit

13 Threads	907 Posts	110K Credits

Credits: 12299

Send PM

色k Posted 2018-2-23 12:39

见《撸题集》第 173 页题目 2.1.27
或者参考 forum.php?mod=viewthread&tid=4725

Reply Edit

Return to list New

Mobile version|Discuz Math Forum

2025-5-31 10:46 GMT+8

Powered by Discuz!

× Quick Reply To Top Edit