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प्रश्न
Choose the correct alternative:
`(1 + cos pi/8) (1 + cos (3pi)/8) (1 + cos (5pi)/8) (1 + cos (7pi)/8)` =
विकल्प
`1/8`
`1/2`
`1/sqrt(3)`
`1/sqrt(2)`
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उत्तर
`1/8`
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