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:
A
B
C
a
b
c
a:
m ▾
b:
cm ▾
c:
cm ▾
A
=
cos
−
1
(
b
2
+
c
2
−
a
2
2
b
c
)
A = \cos^{-1} \left( \dfrac{b^2 + c^2 - a^2}{2bc} \right)
A
=
cos
−
1
(
2
b
c
b
2
+
c
2
−
a
2
)
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