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

[" 52.Given,the function "f(x)=(a^(x)+a^(-x))/(2),(a>2)],[" Then,"f(x+y)+f(x-y)" is equal to "],[[" (a) "2f(x)*f(y)," (b) "f(x)*f(y)],[" (c) "(f(x))/(f(y))," (d) None of these "]]

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