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Mathematics
Mathematics
Problem
Calculate the coefficient of
x
4
x^{4}
x
4
in the expansion of
(
x
−
1
x
)
8
(x-\dfrac{1}{x})^{8}
(
x
−
x
1
)
8
. a)
56
56
56
b)
−
28
-28
−
28
c)
28
28
28
d)
70
70
70
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