מה קרה פה?

תשובה:

# | חטא (x) | <= 1 "ו" arctan (x) / x> = 0 #

הסבר:

# "As" | חטא (x) | <= 1 ", ו" arctan (x) / x> = 0, "יש לנו" #

# | (חטא (1 / sqrt (x)) arctan (x)) / (x sqrt (ln (1 + x))) | <= | arctan (x) / (x sqrt (ln (1 + x))) | #

# (arctan (x) / x ו - sqrt (…)> 0 "") # #

# (x =) sqrt (x ^ -1) x sqrt (ln (1 + x)) # #

# (x) x (x) x (x) x x (x ^ -1 ln (1 + x)) #