So sánh cos 35 và cot 35
Answers ( )
- hongocha02021-07-26T22:12:52+00:00 26/07/2021 at 22:12Reply
Ta có:
$+) \quad \tan37^o > \tan35^o$
$\tan35^o = \dfrac{\sin35^o}{\cos35^o} > \sin35^o$ (Do $\cos35^o < 1$)
$\Rightarrow \tan37^o > \sin35^o$
$+) \quad \tan55^o > \tan50^o$
$\tan50^o =\dfrac{\sin50^o}{\cos50^o} > \sin50^o$ (Do $\cos50^o < 1$)
$\Rightarrow \tan55^o > \sin50^o$
$\Rightarrow \tan55^o > \cos40^o$