1. Let f(x)= cos(9x) and g(x)=3+2 sin(9x). d f(x)] (a) Find dx (g(x)) [Give the answer in terms of sin(9x).] (b) Evaluat
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1. Let f(x)= cos(9x) and g(x)=3+2 sin(9x). d f(x)] (a) Find dx (g(x)) [Give the answer in terms of sin(9x).] (b) Evaluat
1. Let f(x)= cos(9x) and g(x)=3+2 sin(9x). d f(x)] (a) Find dx (g(x)) [Give the answer in terms of sin(9x).] (b) Evaluate S 2 f(x).g(x)dx . (25 marks)
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