Q3 Matemática
(Austrian-Polish 1978)
03 | Austrian-Polish | 1978 | Matemática
Prove que
44
tg
1
∘
⋅
tg
2
∘
⋅
⋯
⋅
tg
4
4
∘
<
2
−
1
<
44
tg
1
∘
+
tg
2
∘
+
⋯
+
tg
4
4
∘
.