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1/2gt0,1/3gt0 and (1/2)(1/3)lt1 implie...

`1/2gt0,1/3gt0` and `(1/2)(1/3)lt1`
`impliestan^(-1)(1/2)+tan^(-1)(1/3)`
`="tan"^(-1)(1/2+1/3)/(1-1/2 1/3)=tan^(-1)(1)=(pi)/4`

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