Question

how to find value of sin inverse

Answer 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 thesine function .It happens at Π/2 and then again at 3Π/2 etc.. 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.

Answer 2

this way
by knowing value if sine u can calculate sine inverse