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对\(\forall x \in {\mathbf{R}}\),函数\(f\left( x \right)\)都有\(f\left( x \right) + f\left( {2 - x} \right) = 0\),则\(f\left( x \right) = \)___.(答案不唯一,写出一个即可)
参考答案:\(\sin \pi x\)(答案不唯一)
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