# In triangle ABC, if A+B+C = pie, then the value of cos(a+b/2) is

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**Answer:**

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**Step-by-step explanation:**

A+B+C = 22/7

a+b = 22/7-C

Multiple by ( cos ) both side we have.

cos (a+b) = cos (22/7-c)

Divided by 2 both side

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