h.tan

来自「强大的数学工具包」· TAN 代码 · 共 33 行

                            * * * * * * * *
                            *   sin, cos  *
                            *   tan, cot  *
                            * * * * * * * *

        "sinus, cosinus, tangens, cotangens"
        SYNTAX: X = sin(A)
                X = cos(A)
                X = tan(A)
                X = cot(A)

        A is an expression whose value is an integer, a rational
        or a floating point number.

        X is assigned the value of the trigonometric function at A.

        For X = tan(A), A must not be of the form Pi/2 + k * Pi with
        k in Z. 
        For X = cot(A), A must not be of the form k * Pi with k in Z.
        
        Warning: Possibly, the above conditions are not exactly 
                 recognized.


        Example 1: (correct)

                sin(Pi/4)


        Example 2: (correct)

                cot(Pi/2)