calculate tan(pi/4)

Let's evaluate: $\tan \left(\frac{\pi }{4}\right)$

ⓘ The tangent is the y-coordinate (vertical axis) divided by the x-coordinate (horizontal axis) of the point reached on the unit circle after a rotation of $\frac{\pi }{4}$ radians from the horizontal axis pointing to the right, provided the x-coordinate is not zero, this is a remarkable value: $\tan \left(\frac{\pi }{4}\right)$ = $1$

▶Result:   $1$