The value of cos (pi// 4 + x) + cos (pi/...

The value of cos `(pi// 4 + x) + cos (pi// 4 - x)` is

A

`sqrt(2)sin^(2)x`

B

`sqrt(2)cos x`

C

`sqrt(2)cos^(2)x`

D

`sqrt(3) cos x`

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The correct Answer is:

A

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