In an A.P., prove that : `T_(m+n) + T_(m-n) = 2*T_(m)`

Explanation

To prove that \( T_{m+n} + T_{m-n} = 2T_m \) in an arithmetic progression (A.P.), we will follow these steps:

### Step 1: Write the general term of an A.P.
The general term \( T_n \) of an A.P. can be expressed as:
\[ T_n = a + (n-1)d \]
where \( a \) is the first term and \( d \) is the common difference.
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