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`(1+cos. ( pi)/(8))(1+ cos. ( 3pi)/(8)) ( 1+ cos. ( 5pi)/(8)) ( 1+ cos. ( 7pi)/(8))=`

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`(1+cos. ( pi)/(8))(1+ cos. ( 3pi)/(8)) ( 1+ cos. ( 5pi)/(8)) ( 1+ cos. ( 7pi)/(8))=`
A. `(1)/(2)`
B. `cos. ( pi)/(8)`
C. `(1)/(8)`
D. `(1+sqrt(2))/(2sqrt(2))`
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1 Answer

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Correct Answer - c
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