cordic methods describe essentially the same algorithm that with suitably chosen inputs can be used to calculate a whole range of scientific functions including sin, cos, tan, arctan, arcsin, arccos, sinh, cosh, tanh, arctanh, log, exp, square root a

cordic算法，实现加减乘除、幂次方、开方的运算(CORDIC algorithm implementation, power add, subtract, multiply and divide and square root operations)