Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
In a triangle
A
B
C
ABC
A
B
C
,
cos
3
A
+
cos
3
B
+
cos
3
C
=
1
\cos 3A + \cos 3B + \cos 3C = 1
cos
3
A
+
cos
3
B
+
cos
3
C
=
1
, then find any one angle.
Browse the problem library