 Hi and welcome to this session. Let's discuss the following question. The question says find the multiplicative inverse of each of the complex numbers given in the exercises 11 to 13. Now 13 part is minus iota. Let's now start the solution. Let z is equal to minus iota. Now, we have to find the multiplicative inverse of minus iota. Multiplicative inverse of a non-zero complex number z is same as its reciprocal. So that means we have to find 1 by z. Now 1 by z is equal to 1 upon minus iota. Right. Now we will multiply the numerator and denominator by conjugate of denominator that is minus iota. You should know that conjugate of a complex number a plus iota b is obtained by replacing iota with minus iota. So conjugate of a plus iota b is a minus iota b. So conjugate of minus iota is plus iota. 1 by z is equal to 1 upon minus iota into iota upon iota. And this is equal to iota upon minus iota square. Now, you know that iota square is equal to minus 1. So this is equal to iota. Multiplicative inverse of minus iota is plus iota. This is our required answer. Bye and take care.