In a Delta ABC ,if angle,A,B,C are in A....

In a `Delta ABC` ,if angle,`A,B,C` are in A.P then `(a+c)/(sqrt(a^(2)-ac+c^(2)`
`1.cos((A-C)/(2))`
` 2. 2cos((A-C)/(2))`
` 3. 2sin((A-C)`
`4. 2cos(A+C)`

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