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1. u= 3x sinx Reference Answer: du = 3x(xcosx+2sinx)dx 2. u= 2xcosx-2sinx Reference Answer: du = -2xsinx 3. u= x-tanx Reference Answer: du= (1-secx)dx

1. u= 3x sinx Reference Answer: du = 3x(xcosx+2sinx)dx 2. u= 2xcosx-2sinx Reference Answer: du = -2xsinx 3. u= x-tanx Reference Answer: du= (1-secx)dx 4. u= (cos 3)x du Reference Answer: dx = 2xcos3

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