 Hi again, in this lesson we're going to talk about that how to find the square root of negative number in Python programming language. If you for example try to import MAT module and to use function for square root and as an argument put number minus one or any negative number you will get an error. If you want to find a square root of a negative number your result will be a imaginary number or let's say complex number. So in order to work and to get complex numbers results you need to import CMAT module and with this module and the usage of function for square root and putting inside as an argument any negative value you will get the returning value which is in our case imaginary or complex number. So if you want to work with real numbers and get real results you will import MAT module and use method for square root and if you want to work with negative numbers and get imaginary or complex numbers you need to import CMAT module and call exact the same function with the same name on the CMAT module. That's all in this lesson. Thanks for watching. Bye bye.