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Questions  

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

a
1
b
2
c
3
d
4

detailed solution

Correct option is A

cotx=−cotx,      cotx<0cotx,             cotx≥0Case(i): Let cotx≥0.  Then              cotx=cotx+1sinx             1sinx=0              sinx=∞ which is impossible               Case(ii): Let cotx<0.  Then              -cotx=cotx+1sinx                ⇒cosx=-12               ⇒x=2π3,4π3     ∵0

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