Question: (b) Evaluate: 4 x cos (25 - x2 ) dx 3 by first substituting u = 25 -x2 and demonstrating the method of substitution of

(b) Evaluate: 4 x cos (25 - x2 ) dx 3 by first substituting u = 25 -x2 and demonstrating the method of substitution of variable fully. (4 marks)
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