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Asin

ASIN Function

The ASIN function in Excel returns the arcsine (or inverse sine) of a number. The result, in radians, is between -π/2 and π/2. Essentially, it gives you the angle whose sine is the specified number.

Syntax:

ASIN(number)
  • number: This is a required argument. It must be a numeric value between -1 and 1 (inclusive), representing the sine of the angle you want to find.

Examples:

  1. =ASIN(0.5) would return an angle in radians, approximately 0.5236 (or 30° when converted to degrees).
  2. =ASIN(1) would return π/2 (approximately 1.5708 radians, or 90°).
  3. =ASIN(A1) would return the arcsine of the number in cell A1, provided the value in A1 is within the valid range.

Note: If you want the result in degrees rather than radians, you can combine the ASIN function with the DEGREES function like this: =DEGREES(ASIN(number)).