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If alpha =22^(@) 30, then (1+ cos alph...

If `alpha =22^(@) 30,` then
`(1+ cos alpha) (1+ cos 5 alpha) (1+ cos 7 alpha)` equals

A

`1/8`

B

`1/4`

C

`(1+sqrt2)/(2sqrt2)`

D

`(sqrt2-1)/(sqrt2+1)`

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