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सिद्ध कीजिए की : sin ( 45^(@) +A) -si...

सिद्ध कीजिए की :
` sin ( 45^(@) +A) -sin (45^(@) -A) =sqrt( 2) sin A `

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sin (45 ^ (@) + A) sin (45 ^ (@) - A) = (1) / (2) cos2A

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