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2gt0,3gt0 and 2,3gt1impliestan^(-1)(2)+t...

`2gt0,3gt0` and `2,3gt1impliestan^(-1)(2)+tan^(-1)(3)`
`=pi+tan^(-1)((2+3)/(1-2.3))`
`=pi+tan^(-1)(-1)=pi-(pi)/4=(3pi)/4`

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