If [sin−1x]>[cos−1x] , where [.] denotes the greatest integer function, then complete set of values of x is
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a
[cos1,1]
b
[sin1,1]
c
[cos1,sin1]
d
[0,1]
answer is B.
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Detailed Solution
[sin−1x]>[cos−1x] , 0≤cos−1x≤π ⇒ cos−1x=0,1,2 or 3 and −π/2≤sin−1x≤π/2 ⇒ sin−1x=−2,−1,0,1 [sin−1x]>[cos−1x] ⇒ [sin−1x]=1.[cos−1x]=0 ⇒ sin1≤x≤1 , cos1π/4, sin1>cos1 Hence, required set of values of x is [sin1,1] .