1) Find the titles of all courses that have been taught in every semester/year.

2) Find the course id of all courses offered in Spring 2022 using only fundamental operations.

3) Find the names of all instructors who have taught the same course more than once.

Consider the Schema diagram for a university database shown in Figure 2.8 on page 47 of the textbook. Express each of the following queries in relational algebra USING only the operations that we discussed in the lecture. - Be sure that the resulting relation lists just the attributes that are given in the instruction. - Do not include unnecessary relations in your queries