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Problem
Problem
The value of
c
1
2
−
2
c
1
c
2
cos
2
A
+
c
2
2
c_1^2 - 2c_1c_2 \cos 2A + c_2^2
c
1
2
−
2
c
1
c
2
cos
2
A
+
c
2
2
is a.
4
a
cos
A
4a \cos A
4
a
cos
A
b.
4
a
2
cos
A
4a^2 \cos A
4
a
2
cos
A
c.
4
a
cos
2
A
4a \cos^2 A
4
a
cos
2
A
d.
4
a
2
cos
2
A
4a^2 \cos^2 A
4
a
2
cos
2
A
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