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In triangle ABC if $a \cos ^2 \large\frac{C}{2}$$+c \cos ^2 \large\frac{A}{2}=\frac{3b}{2}$, then the sides of the triangle are in

(a) an arithmetic progression

(b) a geometric progression

(c) a harmonic progression

(d) an arithmetic-geometric progression

1 Answer

(a) an arithmetic progression
answered Nov 7, 2013 by pady_1
 

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