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Problem
Problem
If
x
4
f
(
x
)
−
1
−
sin
(
2
π
x
)
=
∣
f
(
x
)
∣
−
2
f
(
x
)
x^4 f(x) - \sqrt{1 - \sin(2\pi x)} = |f(x)| - 2f(x)
x
4
f
(
x
)
−
1
−
sin
(
2
π
x
)
=
∣
f
(
x
)
∣
−
2
f
(
x
)
, then
f
(
−
2
)
f(-2)
f
(
−
2
)
equals (a)
1
17
\frac{1}{17}
17
1
(b)
1
11
\frac{1}{11}
11
1
(c)
1
2
\frac{1}{2}
2
1
(d) 0
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