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For 0 lt theta lt pi/2 , the solution (s...

For `0 lt theta lt pi/2` , the solution (s) of `sum_(m=1)^6cos e c(theta+((m-1)pi/4)) cos e c(theta+(mpi)/4) = 4sqrt(2) . ` Find correct options

A

`pi/4`

B

`pi/6`

C

`pi/12`

D

`(5 pi)/(12)`.

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