ASIN

The ASIN function, also called arc-sine, returns the inverse sine of a value. The input number must be between -1 and 1, inclusive. Geometrically, given the ratio of a triangle's opposite side over its hypotenuse, the function returns the angle of the triangle. For example, given a ratio of 0.5 the function returns the angle of 0.524 radians. To convert the result from radians to degrees, multiply the result by 180/PI() or use the DEGREES function. For example, to convert the result of ASIN(0.5) to degrees, you can use either formula below: The graph of ASIN visualizes the output of the function from -1 to 1. ASIN is the inverse of SIN. However, because SIN is a periodic function, the output of ASIN is limited to the range from -π/2 to π/2. Graph courtesy of wumbo.net