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Mathematics
Mathematics
Problem
Find the value of
d
d
x
(
cos
4
x
)
∣
x
=
π
/
8
\displaystyle \left.\frac{d}{dx}\bigl(\cos 4x \bigr)\right|_{x=\pi/8}
d
x
d
(
cos
4
x
)
x
=
π
/8
.
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