i need help with these problems

i need help with these problems

1. Find the critical numbers of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)

f(x) = x−5 ln x

2.Find the absolute minimum and absolute maximum values of 
f on the given interval.

f(t) = 16 cos t + 8 sin 2t,

[0, 
π/2]

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