**Problem 1.** Find the sum of the following series:

\( \tan ^2(1^o)+\tan ^2(3^o)+\tan ^2(5^o)+…+\tan ^2(89^o) \)

Next Problem | Problems 1 – 10 |

\( \tan ^2(1^o)+\tan ^2(3^o)+\tan ^2(5^o)+…+\tan ^2(89^o) \)

Next Problem | Problems 1 – 10 |