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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

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The correct Answer is:
`rArr a,b,c ` are in A.P.
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