<p>the problem is:
Let the partial fraction be defined as:
(9x2 + x -1) * x-2 * (x + 1 )-1 = A/x + B/x2 + C/(x + 1).
Find A.</p>
<p>the problem is:
Let the partial fraction be defined as:
(9x2 + x -1) * x-2 * (x + 1 )-1 = A/x + B/x2 + C/(x + 1).
Find A.</p>