1.

If y=cos^(-1)((x-x^(-1))/(x+x^(-1))), then (dy)/(dx) is

Answer»

`{:{((2)/(1+x^(2))",",xgt0),(-(2)/(1+x^(2))",",XLT0):}`
`{:{((2)/(1+x^(2))",",xgt0),("does not exist"",", x=0),((-2)/(1+x^(2))",",xlt0):}`
`{:{((2)/(1+x^(2))",",xlt0),("does not exist"",", x=0),((-2)/(1+x^(2))",",xgt0):}`
NONE of these

Answer :C


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