Graphical Visualization of the Inverse Sine of y (arcsin)

① This example provides an interactive graphical view of the meaning of arcsin(y), showing how a given y-value corresponds to an angle α on the unit circle. ② The core mathematical concept is the inverse trigonometric function, specifically the arcsine, including its domain, range, and relationship to the sine function, along with angle measurement and right-triangle side ratios. ③ Construction details: Using GeoGebra commands such as Intersect, Point, Circle, OrthogonalLine, Segment, and Angle, the objects A, B, c, Y, a, P, E, b, α, and d are created. By dragging point Y or a slider, the y-value changes dynamically, and the resulting angle α is updated in real time. ④ This resource is suitable for high school or early college students learning inverse trigonometric functions, and serves as an effective teaching aid for instructors or a self-exploration tool for learners to grasp the definition and graph of arcsin.