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Q.

If ‘n’ be the number of solutions of the equation cotx=cotx+1sinx0<x<2π, then n=

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a

2

b

1

c

3

d

4

answer is A.

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Detailed Solution

cotx=cotx,cotx<0    cotx,cotx0

 Case I: cotx0

cotx=cotx+1sinx1sinx=0

sinx=, this is not possible 

 Case II: cotx<0cotx=cotx+1sinx cosx=-12

cosx=cosπ+π3 or cosππ3

x=2π3,4π3 but x=4π3cotx>0

n=1

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