When the sine graph is at its peak, what is the sine value?

The sine graph, which represents the values of the sine function, reaches its peak at the point where the angle corresponds to 90 degrees (or π/2 radians). At this peak, the sine function achieves its maximum value of 1. This means that whenever the angle is 90 degrees, the sine of that angle is precisely equal to 1.

In the context of the graph, this peak signifies the highest point on the curve, which directly corresponds to the maximum output value of the sine function. Understanding this characteristic of the sine function is vital for solving problems related to trigonometry and wave motion, where the sine function often represents periodic behavior.