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सिद्ध कीजिए की ( 1+ cos ""(pi)/(8)) (1+...

सिद्ध कीजिए की ` ( 1+ cos ""(pi)/(8)) (1+ cos ""(3pi)/( 8) ) (1+cos""(5pi)/( 8)) (1+ cos ""( 7pi)/(8)) =(1)/(8) `

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