It is known or found that three edges are 3, 3, 4,

There are three more? +3? ≠4? Therefore, it is not a right triangle, so you can't find tanB with the opposite side, adjacent side and hypotenuse.

You have to use the same angle trigonometric function relationship to find it.

Cosb = 1/9 has been found. Use sin? B+cos？ B= 1

Available sinb = 4 √ 5/9

Then use sinb/cosb = tanb.

Available tanb = 4 √ 5