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Mathematics
Problem
Calculate the coefficient of
x
4
x^{4}
x
4
in the product
(
1
−
x
)
−
2
sin
x
(1-x)^{-2}\sin x
(
1
−
x
)
−
2
sin
x
. a)
4
4
4
b)
13
3
\dfrac{13}{3}
3
13
c)
11
3
\dfrac{11}{3}
3
11
d)
8
3
\dfrac{8}{3}
3
8
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