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Mathematics
Mathematics
Problem
If the sides be
a
,
b
,
c
a, b, c
a
,
b
,
c
, then show that
a
cos
A
+
b
cos
B
+
c
cos
C
=
4
R
sin
A
sin
B
sin
C
a \cos A + b \cos B + c \cos C = 4R \sin A \sin B \sin C
a
cos
A
+
b
cos
B
+
c
cos
C
=
4
R
sin
A
sin
B
sin
C
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