I don't understand what you have against interpolating between close data points? High precision cutting tools have been doing it for decades.
pi is not a function. It is a value. You can determine the value of pi from atan(1.0), or you can hardcode it to more decimal places than the Arduino can handle.
does there exist a multiple-precision C or C++ math library that could be used with Arduino?
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16