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

[" If "f(x)=(2^(x)+2^(-x))/(2)" ,then "],[[f(x+y)*f(x-y)=," - "],[" (n) "(1)/(4)(1)/(4)[f(2x)+f(2y)],(1)/(2)[f(2x)+f(2y)]],[" c) "(1)/(2)[f(2x)-f(2y)]]]

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