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सिद्ध कीजिए कि - (i) tan ( 45^(@) -...

सिद्ध कीजिए कि -
(i) ` tan ( 45^(@) - A/2) = (1-sinA)/(cosA) `
(ii) ` tan (45^(@) + A/2) = (cosA)/(1-sinA)`

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