The function \( f(x)=-x / 2+\sin x \) defined on \( [-\pi / 3, \pi / 3] \) is (a) increasing (b)...

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The function \( f(x)=-x / 2+\sin x \) defined on \( [-\pi / 3, \pi / 3] \) is
(a) increasing
(b) decreasing
(c) constant
(d) none of these
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