## What is the arcsine of 1 ?

arcsin 1 = ?

The arcsine is the inverse sine function.

Since

sin π/2 = sin 90º = 1

The arcsine of 1 is equal to the inverse sine function of 1, which is equal to π/2 radians or 90 degrees:

arcsin 1 = sin^{-1} 1 = π/2 rad = 90º

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