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Which of the following pairs of function...

Which of the following pairs of function/functions has same graph? `y=tan(cos^(-1)x); y=(sqrt(1-x^2))/x`
`y=t a n(cot^(-1)x);y=1/x`
`y="sin"(tan^(-1)x); y=x/(sqrt(1+x^2))`
`y="cos"(tan^(-1)x); y=sin (cot^(-1)x)`

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