## 1 Answer

If you're referring to the angle \(\theta\) (theta), then the ratio \(y^{\prime} / x^{\prime}\) is equivalent to the tangent of the angle \(\theta\), denoted as \(\tan (\theta)\).

This is because in a right triangle, the tangent of an angle is defined as the ratio of the side opposite the angle (often denoted as \(y\) ) to the side adjacent to the angle (often denoted as \(x\) ).

So, \(y^{\prime} / x^{\prime}=\tan (\theta)\)