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证明:如果 f 是偶函数( f(-x) = f(x) )且 g 是奇函数( g(-x) = -g(x) ),则 是奇函数。
证明:如果 f 是偶函数( f(-x) = f(x) )且 g 是奇函数( g(-x) = -g(x) ),则 是奇函数。
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