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Questions  

The set of values of x such that sin1xcos1x>0are

a
x∈12,1
b
x∈1,12
c
x∈12,-1
d
12,1

detailed solution

Correct option is A

sin−1x−cos−1x>0⇒sin−1x-π2-sin−1x>0⇒sin−1x>π4         ∴x∈12,1 as  x≤1

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