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सिद्ध कीजिए की ( 1+cos ""(pi)/(10) )( 1...

सिद्ध कीजिए की ` ( 1+cos ""(pi)/(10) )( 1+cos ""(3pi)/( 10)) (1+cos ""(7pi)/( 10 )) (1+ cos ""(9pi)/(10)) =(1)/(16)`

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