Show that the sum of `(m+n)^(t h)`and `(m-n)^(t h)`terms of an A.P. is equal to twice the `m^(t h)`term.

Explanation

To solve the problem, we need to show that the sum of the \( (m+n)^{th} \) and \( (m-n)^{th} \) terms of an Arithmetic Progression (A.P.) is equal to twice the \( m^{th} \) term.

### Step-by-Step Solution:

1. **Understanding the A.P. Terms**:
The \( n^{th} \) term of an A.P. is given by the formula:
\[
T_n = a + (n - 1) \cdot d
...