7. Let f :[0,3]→[0,3] be a continuous function with f(0)=0 and f(3)=3. If f is one-to-one and 
, then
=________ ,where f-1 is the inverse function of.
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7. Let f :[0,3]→[0,3] be a continuous function with f(0)=0 and f(3)=3. If f is one-to-one and , then=________ ,where f-1 is the inverse function of.