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[" (c) "(-1,0)uu(1,2)uu(2,oo)quad " (d) ...

[" (c) "(-1,0)uu(1,2)uu(2,oo)quad " (d) "(1,2)uu(2,oo)],[" 2.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 odd "],[" function.Then "f_(1)(x+y)+f_(1)(x-y)" equals "],[[" (a) "2f_(1)(x+y)*f_(2)(x-y)," (b) "2f_(1)(x+y)*f_(1)(x-y)],[" (c) "2f_(1)(x)*f_(2)(y)," (d) "2f_(1)(x)*f_(1)(y)]]

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