Find l.u.b and g.l.b.set (a){cos nπ:n eql 0,1,2,...}(b) {1/1+x sq.:-5 less eql x less eql 4}.B.Sc.I.

(a) {cos nπ:n equal to 0,1,2,...}
(b) 1 upon 1 plus x square: minus 5 less than equal x less than equal 4}.
B. Sc. I. D C 15.
HUKAM RAJ BHAGAT.
@hukamrajbhagat9437.