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[tan^(-1)(1)/(7)+tan(1)/(13)=cos^(2)(1)/...

[tan^(-1)(1)/(7)+tan(1)/(13)=cos^(2)(1)/(9)],[tan^(-1)(1)/(3)+tan^(-1)(1)/(5)+tan^(-1)(1)/(7)+tan^(-1)(1)/(8)=(pi)/(4)],[quad " the "sin(-1^(2)-1)=tan^(-1)(4)/(2)]

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