Hi

can someone help me with the following partial fraction decomposition. It is important that the answer has no complex number.

$\displaystyle

\frac{4}{s^{2}(s^{2}+1)} = \frac{A}{s^{2}} + \frac{B}{s^{2}+1}

$

is

$\displaystyle

A(s^{2}+1) + Bs^{2} = 4

$