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Problem
Problem
If in a triangle,
a
cos
2
C
2
+
c
cos
2
A
2
=
3
b
2
a \cos^2 \frac{C}{2} + c \cos^2 \frac{A}{2} = \frac{3b}{2}
a
cos
2
2
C
+
c
cos
2
2
A
=
2
3
b
, then its sides will be in - a. AP b. GP c. HP d. AGP
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