Question: a) By using a suitable substitution, evaluate the following definite integral. Ensure that full workings are presented. 5 i. dt (3 marks) +4 00 14

a) By using a suitable substitution, evaluate the following definite integral. Ensure that full workings are presented. 5 i. dt (3 marks) +4 00 14 ii. sec?(20)etan(20) de (3 marks) b) Find the area bounded by the curve y = r cos (r? ), the x - axis and the lines x = 0 and a = 2 (4 marks)

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