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Mathematics
Mathematics
Problem
Calculate the value of
d
d
x
[
(
2
x
2
+
1
)
cos
x
]
\dfrac{d}{dx}\big[(2x^{2}+1)\cos x\big]
d
x
d
[
(
2
x
2
+
1
)
cos
x
]
at
x
=
π
3
x=\dfrac{\pi}{3}
x
=
3
π
.
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