πの求め方 こう書いてもおｋ import Text.Printf import Control.Monad -- 自作の逆正接関数 myAtan::Double->Double->Int->Double->Double myAtan x x2 n t = let m = (fromIntegral (n `div` 2)) denom = (m * m * x2) / ((fromIntegral n) + t) num = n -…