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[" Given the function "f(x)=(a^(x)+a^(-x...

[" Given the function "f(x)=(a^(x)+a^(-x))/(2)" (where "a>2" ) then "f(x+y)+f(x-y)=],[[" (A) "2f(x)*f(y)," (B) "f(x)*f(y)," (C) "(f(x))/(f(y))," (D) None of these "]]

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