Mike D. answered 02/05/21
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As x approaches 0 this function approaches 0/0 which is indeterminate
So use L'Hopitals Rule
lim x>0 cot x / cot 2x = lim x>0 d/dx (cotx) / d/dx (cot2x) .....
and keep applying LHopitals rule until you get a function that is NOT 0/0 or ∞ /∞