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1/3gt0,3/4gt0impliestan^(-1)(1/3)-tan^(-...

`1/3gt0,3/4gt0impliestan^(-1)(1/3)-tan^(-1)(3/4)`
`=tan^(-1)((1/3-3/4)/(1+1/3 . 3/4))=tan^(-1)((-5)/15)=tan^(-1)(1/3)`
`=-tan^(-1)(1/3)`

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