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[" 6.Let "f(x)=a^(x)(a>0)" be written as...

[" 6.Let "f(x)=a^(x)(a>0)" be written as "f(x)=f_(1)(x)+f_(2)(x)],[" where "f_(1)(x)" is an even function and "f_(2)(x)" is an "(x)/(2)],[" function.Then "f_(1)(x+y)+f_(1)(x-y)" equals."],[[" (a) "2f_(1)(x)f_(1)(y)," (d) "2f_(1)(x+y)f_(2)(x-y)],[" (c) "2f_(1)(x)f_(2)(y)," (d) "2f_(1)(x+y)f_(1)(x-y)]]

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