# ASIN

The ASIN function returns the arcsine (inverse sine) of a number. It is useful for calculating angles or ratios involving trigonometric operations, particularly in mathematics and engineering applications.

## Syntax

=ASIN(`number`

)

`number` | The value for which to calculate the arcsine | expressed in radians. | |

`radians` (Optional) | A logical value that specifies the unit of measurement for the input value. If TRUE or omitted | the input is considered in radians; if FALSE | the input is considered in degrees. Defaults to TRUE if omitted. |

`radian_mode` (Optional) | An integer that provides the angular mode to use for number computation. Defaults to 0 (quadrant mode) if omitted. |

## About ASIN

When diving into the realm of trigonometry and needing to reverse the sine operation to obtain an angle or ratio, the ASIN function in Excel comes to the rescue. It serves as a practical tool for evaluating the arcsine of a given number, particularly valuable for those engaged in mathematical and engineering endeavors. To effectively employ ASIN, simply input the desired number for the arcsine calculation. The function will return the corresponding angle in radians, assuming the input is considered in radians unless stated otherwise. You also have the option to specify the unit of measurement for the input value by utilizing the radians argument. By setting radians to FALSE, you can indicate that the input value is in degrees. Additionally, the radian_mode argument allows you to define the angular mode for computation, providing flexibility in handling angular measurements. ASIN excels in facilitating trigonometric calculations and is a reliable ally when dealing with inverse sine operations, ensuring accurate outcomes for mathematical and engineering purposes.

## Examples

For example, supposing you want to determine the arcsine of the number 0.5, which represents the sine of a certain angle in radians. The formula would be: =ASIN(0.5) This will yield the angle in radians corresponding to the arcsine of 0.5.

To calculate the arcsine of a value given in degrees, such as 30 degrees, you can use the formula: =ASIN(SIN(RADIANS(30))

## Questions

**What does the ASIN function return?**

The ASIN function returns the arcsine of a given number, expressing the corresponding angle in radians by default. The result represents the inverse sine operation, providing useful insights for trigonometric calculations and angle evaluations.

**How can I utilize the ASIN function to handle input values in degrees?**

To handle input values in degrees, you can set the optional `radians`

argument to FALSE, indicating that the input number is considered in degrees. This enables the ASIN function to calculate the arcsine for values expressed in degrees instead of radians.

**Can I customize the angular mode for computation in the ASIN function?**

Yes, you can customize the angular mode for computation by specifying the optional `radian_mode`

argument. This allows you to control the quadrant mode and angular measurements, offering versatility in handling trigonometric calculations and angle evaluations.

## Related functions

ACOS

ATAN

SIN

COS

TAN