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If acos^(2).(C)/(2)+c"cos"^(2)(A)/(2)=(3...

If `acos^(2).(C)/(2)+c"cos"^(2)(A)/(2)=(3b)/(2),` then show that a, b , c are in A.P

A

An arithmetic progression

B

A geometric progression

C

A harmonic progression

D

An arithmetic-geometric progression

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The correct Answer is:
A
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