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सिद्ध कीजिए कि - (i) sin ( A+B) c...

सिद्ध कीजिए कि -
(i) ` sin ( A+B) cos (A-B) - cos (A+B) sin ( A+B)`
` = sin 2B`
(ii) ` cos (45^(@) - A) cos (45^(@) -B) - sin (45^(@) - A) `
` sin (45^(@) - B) = sin (A+B)`

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