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[" If "tan^(-1)(sqrt(1+x^(2)-1))/(x)=(pi...

[" If "tan^(-1)(sqrt(1+x^(2)-1))/(x)=(pi)/(45)" ,then "],[[" (1) "x=tan2^(@)," (2) "x=tan4^(@)],[" (3) "x=tan((1)/(4))^(@)," (4) "x=tan8^(@)]]

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