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Mathematics
Mathematics
Problem
If in a triangle
A
B
C
ABC
A
B
C
,
a
=
5
,
b
=
4
a = 5, b = 4
a
=
5
,
b
=
4
and
cos
(
A
−
B
)
=
31
32
\cos(A - B) = \frac{31}{32}
cos
(
A
−
B
)
=
32
31
, then the third side
c
c
c
is equal to a. 3 b. 6 c. 7 d. 9
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