The function arcsine can also be defined as?

The arcsine, , is the inverse of the  function. This means that it takes as inputs what would usually be outputs for the  function and produces as outputs what would usually be inputs for the  function.

This can be particularly useful when you're trying to find an angle on a right triangle, but you've only been given the lengths of the sides. To find any angle  in a right triangle, just take , where o is the side opposite  and h is the hypotenuse of the right triangle.