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16^k=1/4
4^ 2k=4^ -1
2k=-1
k=-1/2
...............
log 16 2=m
16^m=2
2^ 4m=2 ^ 1
4m=1
m=1/4
f(1/4)-f(2)=-1/2-1/4=-2/4-1/4=-3/4