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
, side
a
=
5
a = 5
a
=
5
, side
b
=
4
b = 4
b
=
4
, and
cos
(
A
−
B
)
=
31
32
\cos(A-B) = \frac{31}{32}
cos
(
A
−
B
)
=
32
31
. Using the Law of Tangents or other trigonometric identities, find the length of side
c
c
c
.
Browse the problem library