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सिद्ध कीजिए की : 4 "tan"^(-1)(1)/(5)="...

सिद्ध कीजिए की :
`4 "tan"^(-1)(1)/(5)="tan"^(-1)(120)/(119)`

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4tan^(-1)""(1)/(5)-tan^(-1)""(1)/(239)=

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4Tan^(-1)""1/5-Tan^(-1)""1/239=