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

If `alpha=22^@30',`` then (1+cos alpha)(1+cos3alpha)(1+cos5alpha)(1+cos7alpha)` equals

A

`1/8`

B

`1/4`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
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