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If f(x)=a^x, which of the following equa...

If `f(x)=a^x,` which of the following equalities do not hold ? (i) `f(x+2)-2f(x+1)+f(x)=(a-1)^2f(x)` (ii) `f(-x)f(x)-1=0` (iii) `f(x+y)=f(x)f(y)` (iv) `f(x+3)-2f(x+2)+f(x+1)=(a-2)^2f(x+1)`

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