Algebra-2

Question Analysis
This problem tests the understanding of the tangent ratio in a 45-45-90 special right triangle.

Key Concept Explanation
In a 45-45-90 triangle, both legs are equal, and the hypotenuse is times the length of each leg. The tangent of 45 degrees is the ratio of the opposite side to the adjacent side, which is always 1.

Step-by-step Solution
1. Identify the sides: Both legs are 9 units.
2. Calculate the tangent:

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