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Mathematics
Mathematics
Problem
If
f
(
x
)
=
sgn
(
cos
2
x
−
2
sin
x
+
3
)
f(x) = \operatorname{sgn}(\cos 2x - 2 \sin x + 3)
f
(
x
)
=
sgn
(
cos
2
x
−
2
sin
x
+
3
)
, where
sgn
(
)
\operatorname{sgn}()
sgn
(
)
is the signum function, then
f
(
x
)
f(x)
f
(
x
)
a. is continuous over its domain. b. has a missing point discontinuity. c. has isolated point discontinuity. d. has irremovable discontinuity.
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