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सिद्ध कीजिए - ` sec^(-1)(sec""(11pi)/(3))=(pi)/(3)`

Answer» `sec^(-1)(sec""(11pi)/(3))=y`
अब `sec""(11pi)/(3)=sec(4pi-(pi)/(3))implies sec""(11pi)/(3)=sec""(pi)/(3)`
` :. sec^(-1)(sec""(11pi)/(3))=sec^(-1)(sec""(pi)/(3))`
` sec^(-1)(sec""(11pi)/(3))=(pi)/(3)`


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