In a `DeltaABC`, `sum (b + c) cos A=`

Options

A. a+b+c
B. a+b-c
C. a-b+c
D. none of these

Explanation

To solve the problem of finding the value of \( \sum (b + c) \cos A \) in triangle \( ABC \), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Expression**:
We need to find the value of \( \sum (b + c) \cos A \). This can be expanded as:
\[
(b + c) \cos A + (c + a) \cos B + (a + b) \cos C
...