Выполните действие:

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

• \(\frac{2d}{c^2-b^2}\)
• \(\frac{2c}{c^2-b^2}\)
• \(\frac{2-d}{c^2+b^2}\)
• \(\frac{2d}{c^2+b^2}\)