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[" If "y=cos^(-1)((2x)/(1+x^(2)))*th(n(d...

[" If "y=cos^(-1)((2x)/(1+x^(2)))*th(n(dy)/(dx)" is "],[[" 4) "(-2)/(1+x^(2))" for all "x," b) "(-2)/(1+x^(2))" for all "|x|>1],[" c) "(2)/(1+x^(2))" for "|x|>1," d) none of these "]]

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