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Question

For 0<cπ,sinh1(cotx)=

A
log(cotx2)
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B
log(tanx2)
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C
log(1+cotx)
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D
log(1+tanx)
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Solution

The correct option is C log(cotx2)
sinh1x=log(x+1+x2)

So, sinh1(cotx)=log(cotx+1+cotx) =log(cotx+cosecx) =log(1+cosxsinx) =log⎜ ⎜2cos2x22sinx2cosx2⎟ ⎟ =log(cotx2)

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