prove that cot x/cot3x never lies between 1/3 and 3
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Step-by-step explanation:
cotx/cot3x=tan3x/tanx
y€(-infinity,+1/3)U(+3,+infinity)
Y never lies b/w 1/3 and 3
cot3x/cotx never lies b/w 1/3 and 3
Hence proved
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