Fortran Fortran Trigonometric Function: Law of Cosines and Inverse Calculation

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Fortran can recognize trigonometric functions, including the inverse cosine function, which is essential for implementing the Law of Cosines. To calculate the angle 'c' using the inverse of the Law of Cosines, the correct syntax in Fortran is to use the acos() function. The equation can be expressed as c = acos((d**2 + a**2 - b**2) / (2 * a * d)). It's important to consult the Fortran documentation for specific function names, as they may vary between different dialects of the language.
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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))
 
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You are looking for arccos - you will have to check documentation for the correct name of the function, as it differs between dialects.
 
Hi Benzoate,

The inverse cosine function is given by:

acos()
 

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