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Questions  

 Let f:π3,2π3[0,4] be a function defined as f(x)=3sinxcosx+2 . Then f1(x) is given by 

a
sin−1⁡x−22−π6
b
sin−1⁡x−22+π6
c
2π3+cos−1⁡x−22
d
None of these

detailed solution

Correct option is B

y=f(x)=3sin⁡x−cos⁡x+2=2sin⁡x−π6+2------(1) Since f(x) is one-one and onto, f is invertible.  From (1),sin⁡x−π6=y−22 or  x=sin−1⁡y−22+π6 or  f−1(x)=sin−1⁡x−22+π6

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