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cot¯¹ n/Π>Π/6 n belongs to natural numbers, then the maximum value of n is
(a) 1
(b) 5
(c) -5
(d) none of these
From the graph ,we can see that cot x is periodic function with period as Π .
hence ,cot¯¹ n/Π > Π/6 can be found only for ( 0 , Π )
n/Π > cot Π/6
n/Π > 31/2
n > Π.31/2
n > 5.43 or n>=6
answer: none of these
--
regards
Ramesh
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