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Mathematics
Mathematics
Problem
Evaluate
∫
(
2
x
2
−
5
x
+
3
)
cos
3
x
d
x
\displaystyle\int (2x^{2}-5x+3)\cos 3x\,dx
∫
(
2
x
2
−
5
x
+
3
)
cos
3
x
d
x
, expressing the final answer with
cos
3
x
\cos 3x
cos
3
x
taken as a common factor.
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