# How do you find exact value of tan (pi/ 4)?

Use special right triangles to find the value. Since $\frac{\pi}{4}$ = $45$ degrees, use the special right triangle on the left. If you do the $\tan \left(\frac{\pi}{4}\right)$, you do the $\frac{o p p o s i t e}{a \mathrm{dj} a c e n t}$. According to the triangle, the ratio is just one.