#### The CSC function returns the cosecant of a number given in radians.

This function takes a single Number as input. It parses that number in radians and outputs its cosecant.

### Declaration

CSC(number) -> cosecant

### Parameters

**number**(required, type:*Number*)- The number to calculate the cosecant of. This number is parsed in radians.

### Return Values

**cosecant**(type:*Number*)- The cosecant of the given number.

### Examples

The following example returns the cosecant of 45. Note that while the secant of 45 degrees is √2, the tangent of 45 radians is 1.175221363135749 and this is the number the CSC function returns:

CSC(45) -> 1.175221363135749

In order to calculate the cosecant of a number of degrees, said number must first be converted into radians using the function RADIANS. The following example returns the cosecant of forty-five degrees by first converting forty-five degrees into radians and then calculating the cosecant of the resulting number. Note that the output is a numerical estimation of √2:

CSC(RADIANS(45)) -> 1.414213562373095

Mathematically, the cosecant of 0 radians is undefined, and so when 0 is given as input for the SEC function, it outputs NULL, such as in the following example:

SEC(0) -> NULL

### Discussion

Mathematically, the cosecant of an angle is the reciprocal of the sine of that angle. The relationship between the functions CSC and SIN is the same, such that, for some number n:

CSC(n) = 1/SIN(n)