M
myrainbow210


chứng minh rằng:
[TEX]8+4tan\frac{\pi}{8}+2tan\frac{\pi}{16}+tan\frac{\pi}{32} =cot \frac{\pi}{32}[/TEX]
[TEX]8+4tan\frac{\pi}{8}+2tan\frac{\pi}{16}+tan\frac{\pi}{32} =cot \frac{\pi}{32}[/TEX]
Last edited by a moderator: