2007-01-13 11:05:53 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Do you mean using a programming language? Almost all programming languages have a full set of trigonometric functions. The one you would want is usually called acos(), for arccosine. Scientific calculators usually will calculate it too; it's usually the 2nd function of the cos key.
The only other alternative I can think of is to use a series approximation, something like:
acos(x) = π/2 - x - x³/6 - 3x^5/30 - 5x^7/112...
2007-01-13 11:10:11 · answer #1 · answered by Jim Burnell 6 · 0⤊ 0⤋
You want arc cos (alfa), and if you are using a scientific calculator, it will have a key labeled arc cos, or cos-1. If you are writing a computer program, you will need to check out the scientific library for the particular programming language you are using.
2007-01-13 19:10:59 · answer #2 · answered by Anonymous · 0⤊ 0⤋