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Problem
Problem
The expression
(
a
+
b
+
c
)
(
b
+
c
−
a
)
(
c
+
a
−
b
)
(
a
+
b
−
c
)
4
b
2
c
2
\frac{(a+b+c)(b+c-a)(c+a-b)(a+b-c)}{4b^2c^2}
4
b
2
c
2
(
a
+
b
+
c
)
(
b
+
c
−
a
)
(
c
+
a
−
b
)
(
a
+
b
−
c
)
is equal to a.
cos
2
A
\cos^2 A
cos
2
A
b.
sin
2
A
\sin^2 A
sin
2
A
c.
cos
A
cos
B
cos
C
\cos A \cos B \cos C
cos
A
cos
B
cos
C
d. None of these
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