ERCISE 9 (c)
(ii)
I
cos 5x cos2x dx
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7b i. y = 3 cos(2x) + 4 sin(2x). 7b ii. y = ... 3x + 5x ln |x|. 11c. ... 9 x + c. 3j. −. 1. 4 sin(2x) + c1x + c2. 3k. 1. 6 x3 +. 3. 2 x2 + c1x + c2. 3l. 1. 24....
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