BC command not working in CYGWIN

On Windows Cygwin, run setup.exe and search for "bc" in the "Math" category, click on it and hit Next to install.

On Unix/Linux you'll probably be needed to install this package Using:

sudo apt install bc

You need to select the bc package for installation from the "Select Packages" window.
By default setup installs only base category that is ~ 50 packages, while the full availability is ~ 4000.

https://cygwin.com/packages/x86/bc/bc-1.06.95-2