सिद्ध कीजिए की: (i) sin (2n +1) A . sin...

सिद्ध कीजिए की: ` (i) sin (2n +1) A . sin A = sin ^(2) (n+1) A - sin ^(2) n A `
` (ii) cos ^(2)A + cos ^(2)B -2 cos A cos B cos (A+B) =sin ^(2) ( A+B) `

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