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सिद्ध कीजिए कि - (1)/(4)[sqrt(3)"cos"2...

सिद्ध कीजिए कि -
`(1)/(4)[sqrt(3)"cos"23^(@)-sin23^(@)]=(1)/(2)"cos"53^(@)`.

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(1)/(4)[sqrt(3)cos23^(@)-sin23^(@)]=

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