Manuals/calci/ACOS

ACOS(x)

• Where x is the number and it is varying from -1 to 1.
• The value of ACOS(x) is in radians.

• Calci returns the arcCOS (inverse Cos) of a number. Output is the angle in radians.
• The number can be a single value or any number of values.

For example, ACOS(0.5,(-0.2),1) gives the arcCOS or inverseCOS values for each element.

Description

Consider     x = 0.8    then     =ACOS(0.8)    gives    0.64350110879

• This function is the inverse function of COS in trignometry.
• Also it is called as Cyclometric function.
• ACOS is described as arcCOS and denoted by $cos^{-}1(x)$.
• In ACOS(x), x value should be with in -1 & 1.
• To find the angle in degrees, multiply the result angle with 180/PI().
• DEGREES function can also be used.
  

For example ACOS(0.5)*180/PI() or DEGREES(ACOS(0.5)) gives 60

Examples

ACOS(x)

• x   is the COS of the angle

ACOS(x)	Angle(radians)
ACOS(0)	1.57079632
ACOS(1)	0

See Also

• COS

• DCOS

• COSH

References

• List of Trigonometric Functions
• ACOS