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सिद्ध करें कि sin25^(@)*sin65^(@)=cos...

सिद्ध करें कि
`sin25^(@)*sin65^(@)=cos25^(@)*cos65^(@)`

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sin65^(@)+sin25^(@)=

sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

2sin65^@cos25^@=

cos 25^(@) - cos65^(@) =

Evaluate : sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

sin 85^(@)-sin 35^(@) - cos 65^@

sin65^(@)+cos65^(@)=sqrt(2)cos20^(@)