calculus
posted by clare .
can someone please help me with these 3 questions:
1) Evaluate the limit.
lim_(x>infinity) (ln(ln(4 x)))/(4 x)
2)Find y ' and y ".
y= ln(5 x)/x^7
3)y =(arctan)(x  sqrt(1+x^2))
for this question i got y = 1/(2(1+x^2))which was wrong.
Please and thank you!
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