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5/3gt0,1/4gt0impliestan^(-1)(5/3)-tan^(-...

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

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