Выполните действие:
\(\frac{c+d}{c^2-b^2} - \frac{c-d}{b^2-c^2}\) .
\(\frac{2d}{c^2-b^2}\)
\(\frac{2c}{c^2-b^2}\)
\(\frac{2-d}{c^2+b^2}\)
\(\frac{2d}{c^2+b^2}\)