Sin of arcsin x, arcsin of sin x

What is the sine of arcsine of x?

sin (arcsin x) = ?

What is the arcsine of sine of x?

arcsin (sin x) = ?

Since arcsin is the inverse function of sine, the sine of arcsine of x is equal to x:

sin (arcsin x) = x

x has values from -1 to 1:

x∈[-1,1]

Since sine is periodic, the arcsine of sine of x is equal to x plus 2kπ when k is integer:

arcsin (sin x) = x + 2kπ