The value of tan((2k+1)π/2）is not correct

[PaulZhu0122]

Describe the bug

In the scientific calculator module, after choosing tan fuction and entering tan((2k+1)π/2）where k is positive integer, the calculator just displays incorrect result.

Expected behavior

After entering tan((2k+1)π/2, infinity or it doesn't exist is expected to be displayed

To reproduce

1. Open NCalc+ (Which is build from latest source code)
2. Go to scientific calculator module
3. Choose tan function
4. Enter tan((2k+1)π/2）
5. Incorrect result has been displayed

Configuration

• Android version 9
• device MI 8 Lite

Screenshots

[axkr]

To be clear you mean something like Tan[43*Pi/2]

• https://www.wolframalpha.com/input/?i=Tan%5B43*Pi%2F2%5D

which should return ComplexInfinity

• https://github.com/axkr/symja_android_library/blob/master/symja_android_library/doc/functions/ComplexInfinity.md