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Use integration by parts
 \int\limits {u} \, v = uv -  \int\limits {v} \, du

to get:
 \frac{ x^{2}}{4} + \frac{xsin(4x)}{8} + \frac{cos(4x)}{32}
1 3 1
can you plz give all the solution on how to getb the answer
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