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(1+cos (pi/10))(1+cos ((3 pi)/10))(1+cos...

`(1+cos (pi/10))(1+cos ((3 pi)/10))(1+cos((7 pi)/10))(1+cos((9 pi)/10))=` `(i)1/8 (ii) 1/16 (iii)1/4 (iv) 1/6`

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