The inverse sin of 1, ie sin-1 (1) is a very special value for the inverse sine function. Remember that sin-1(x) will give you the angle whose sine is x . Therefore, sin-1 (1) = the angle whose sine is 1.
The Value of the Inverse Sin of 1
As you can see below, the inverse sin-1 (1) is 90° or, in radian measure, Π/2 . '1' represents the maximum value of the sine function .It happens at Π/2 and then again at 3Π/2 etc..
![Inverse sine 1 rule](images/inverse-sin-1-rule.gif)
(see second graph below)
![Picture of Inverse sine of 1](images/picture-of-inverse-sine-of-1.gif)
Below is a picture of the graph sin(x) with over the domain of 0 ≤x ≤4Π with sin(1) indicted by the black dot. As you can see the graph of the sine function has a value of 1 at Π /2 and again at 5Π/2 and 9Π/2 and every 2Π thereafter.
![Inverse sine of 1 long graph](images/picture-of-inverse-sine-of-1-full.gif)
The Value of the Inverse Sin of -1
As you can see below, the sin-1 (1) is 270° or, in radian measure, 3Π/2 . '1' represents the minimum value of the sine function ever gets and happens at Π/2 and then again at 3Π/2 etc..
![Inverse sine 1 rule](images/inverse-sin-negative-1-rule.gif)
(See graph at bottom)
![Picture of Inverse Sine of negative 1](images/picture-of-inverse-sine-of-negative-1.gif)
Below is a picture of the graph of sin(x) with over the domain of 0 ≤x ≤4Π with sin(-1) indicted by the black dot. As you can see from the graph, sine has a value of -1 at 3Π /2 and again at 7Π/2 and 11Π/2 and every 2Π thereafter.
![graph of sin ivnerse of negative 1](images/picture-of-inverse-sine-of-NEGATIV-1-full.gif)