Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Problem
Problem
Solve
cos
2
x
=
1
2
\cos^2 x = \frac{1}{2}
cos
2
x
=
2
1
on
0
≤
x
≤
2
π
0 \le x \le 2\pi
0
≤
x
≤
2
π
.
Browse the problem library