Discuz Math Forum»Forum › Mathematics › High School › 三角函数与对数的碰撞太紧了

Return to list New

View 1624|Reply 3

[不等式] 三角函数与对数的碰撞太紧了

[Copy link]

107 Threads	225 Posts	2905 Credits

Credits: 2905

Send PM

facebooker Posted 2019-6-18 14:41 |Read mode

证明对$∀x>1,x+sinx\geqslant 2ln(x+1)$

Reply Edit

686 Threads	110K Posts	910K Credits

Credits: 91229

Send PM

kuing Posted 2019-6-18 14:47

善用搜索功能，一搜就有了：forum.php?mod=redirect&goto=findpost& … d=2856&pid=10879

Reply Edit

107 Threads	225 Posts	2905 Credits

Credits: 2905

Send PM

Author| facebooker Posted 2019-6-18 15:07

回复 2# kuing

多谢大佬没想到是个老题。。

Reply Edit

770 Threads	4692 Posts	310K Credits

Credits: 35048

Send PM

isee Posted 2019-6-18 16:14

可能是2019年全国卷I引出来的吧

Reply Edit

Return to list New

Mobile version|Discuz Math Forum

2025-5-31 11:18 GMT+8

Powered by Discuz!

× Quick Reply To Top Edit