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निम्नलिखित को सिद्ध कीजिये : cos. (p...

निम्नलिखित को सिद्ध कीजिये :
` cos. (pi/4 -x) cos. (pi/4 -y)`
` - sin (pi/4 - x) sin. (pi/4 -y) = sin.(x+y)`

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