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[" 13.If "f(x)=(2^(x)+2^(-x))/(2)" ,then...

[" 13.If "f(x)=(2^(x)+2^(-x))/(2)" ,then "f(x+y)f(x-y)" is equals to "],[[" (a) "(1)/(2){f(2x)+f(2y)}," (b) "(1)/(2){f(2x)-f(2y)}],[" (c) "(1)/(4){f(2x)+f(2y)}," (d) "(1)/(4){f(2x)-f(2y)}]]

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