Fortran Trigonometric Function: Law of Cosines and Inverse Calculation

[Benzoate]

I want Fortran to regconize trigonometric functions.

The trigonometric equation I am trying to right in Fortran is the Law of cosines

COS(c)=d^2+a^2-b^2/(2*a*d)
However, I want Fortran to calculate the inverse of the above equation:

How would I write the following equation in Fortran?
c=COS^1-(d^2+a^2-b^2/(2*a*d))

 

[Borek]

You are looking for arccos - you will have to check documentation for the correct name of the function, as it differs between dialects.

 

[alphysicist]

Hi Benzoate,

The inverse cosine function is given by:

acos()