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确定函数的奇偶性
$$
f(-x) = (-x) \sin(-x) = (-x)(-\sin x) = x \sin x = f(x)
$$
$$
f(x) \text{ 为偶函数,图象关于 } y \text{ 轴对称,排除 B, D}
$$
确定特殊区间内的函数值符号
$$
x \in (0, \pi) \implies x > 0, \sin x > 0 \implies f(x) > 0
$$
$$
\text{在 } y \text{ 轴右侧靠近原点的区域,图象位于 } x \text{ 轴上方,排除 C}
$$
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- (A) 偶函数且在原点两侧附近为正值 (Correct answer)
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- (C) 偶函数但在原点两侧附近为负值
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