Question: How do I solve this? 15) MATH 1026 3.1.1b [ 104308425 ] Which of the following is an antiderivative of f(x) = x cos(7x) ?

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15) MATH 1026 3.1.1b [ 104308425 ] Which of the following is an antiderivative of f(x) = x cos(7x) ? O a) - - xsin(7x) - cos(7a) - 19 49 1 O b) - xsin(7x) + cos(7x) - 9 49 O c) 7x sin(7x) + cos(7x) + 15 1 O d) - xsin(7x) - cos(7x) + 1 49
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