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Find the value of cos""(pi)/(12)(sin""...

Find the value of
`cos""(pi)/(12)(sin""(5pi)/(12)+cos""(pi)/(4))+sin""(pi)/(12)(cos""(5pi)/(12)-sin""(pi)/(4))`.

A

`1/2`

B

`3/2`

C

`2+sqrt3`

D

`1+(sqrt3)/(2)`

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