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Question

If f(x)=sin{[x+5]+{x{x{x}}}} for xϵ(0,π4) is invertible, where {.} and [.] represent fractional part and greatest integer functions respectively, then f1(x) is


A

sin1x

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B

π2cos1x

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C

sin1{x}

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D

cos1{x}

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