Question: 15. Evaluate the following integrals by using the given substitution. (a) 1 1 + 4x2 dx , tanu = 2x . [4 marks] (b) 4

15. Evaluate the following integrals by using the15. Evaluate the following integrals by using the
15. Evaluate the following integrals by using the given substitution. (a) 1 1 + 4x2 dx , tanu = 2x . [4 marks] (b) 4 - 912 dx, 2 cosu = 3x . [4 marks] 5 (c) 2x2+4x+9 dx, tanu = x+1 . [6 marks]\f

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