Solve tan(45°)

Step-by-step solution

1. $45°$ corresponds to the 45-45-90 isosceles right triangle.

2. Both legs are equal, so opposite/adjacent = $1$.

3. Therefore $\tan(45°) = 1$.

4. Equivalently, on the unit circle at $45°$: $\sin = \cos = \frac{\sqrt{2}}{2}$, so $\tan = \sin/\cos = 1$.