Consider the relations Courses1, Courses2, LEnrollment and Students. Courses2 name cid AS English Courses1 cid ename Al Calculus A2 Algebra A5 English Enrollment sid cid 101 Al 102 A5 103 BI 102 Al 102 A2 Location Classroom L3 L4 | LI L2 BI History L3 B2 Computing L5 Student(sid, sname, age, level) (1) Give the results of the following relational _algebra expressions:

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