Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
State an expression equivalent to
1
−
cos
x
1-\cos x
1
−
cos
x
that is written entirely in terms of
sin
x
2
\sin \dfrac{x}{2}
sin
2
x
.
Browse the problem library