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To find x sin(4x2) cos(9x2) dx, we can use formula #81 (shown below). sin au cos bu du = - cos((a - b)u) -
To find x sin(4x2) cos(9x2) dx, we can use formula #81 (shown below). sin au cos bu du = - cos((a - b)u) - cos((a + b)u) + c Using this, we have u = 2(a - b) a = 2(a + b) and b =
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