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I am using c# decimal for high accuracy project but was stuck at the Atan method because it only accept double. Converting decimal into double will cause a data lose so I am hoping to write my own atan method. Can someone show me how to do it? Thanks in advance!
You don’t need to reinvent the wheel, you can use the DecimalMath class, which has an Atan method, the parameter of the method is decimal and the method returns a decimal too. Read more here.
If you absolutely want to reinvent the wheel and make an implementation yourself, this formula might be useful for you:
arctan(z) = ((z^1)/1)-((z^3)/3)+((z^5)/5)+(((-1)^((2*n)-1))*(((2*n)-1)/((2*n)-1)))
The bigger n is, the more exact is your result.