Acos Acosh Asin Asinh Atan2 Atanh Cosh Cospi Cospi_sub Exp2 Exp2_sub Expm1 Expm1_sub Log10 Log1p Log1p_sub Log2 Log2_sub Powm1 Powm1_sub Sinh Sinpi Sinpi_sub Sqrt1pm1 Sqrt1pm1_sub Tanh

Cospi() Function Cospi ( X As  Double, Optional Info As  Long  ) cos(πx) Purpose Computes cos(πx) with high accuracy. Returns Double cos(πx). Parameters [in] X Argument x. [out] Info (Optional) = 0: Successful exit. = 1: Floating point range error. Reference boost/math/special_functions