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Atan(number)

number

 or 

number

Returns the trigonometric arc tangent (inverse tangent) of number. The arc tangent is the 
angle, in radians, whose tangent is equal to the specified number.

Atan(1) returns 

.

Degrees(Atan(1)) returns 

.

Cos(angleInRadians)

angleInRadians

 - any numeric 

 containing a numeric expression, in 

radians.

number

Returns the cosine of angleInRadians. The specified angle must be represented in 
radians.

Cos(1.047) returns 

.

Cos(Radians(60)) returns 

.