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**Differentiation problem and finding maximum, need helping :)?**

have a few problems with these questions, can you help :)

Using differentiation, find the MAXIMUM value of the following functions?

1. f(x) = x

^{2}/ 4 + 4 / x

2. f(x) = xe

^{-2x2}

3. f(x) = sqrt(x - n) / x ; n>0

hope you guys can help !