F (x) = {4-x, if x is less than or equal to 0 {f (x-1) - f (X-2), if x is greater than 0, then f (3)=
According to x > 0, f (x) = f (x-1) - (X-2) has
f(2)=f(1)-f(0)
So f (3) = f (2) - f (1) = [f (1) - f (0)] - f (1) = - f (0)
=-4
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