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sin(671/2)^(@) + cos(671/2)^(@) is equal...

sin(67`1/2)^(@) + cos(`67`1/2)^(@)` is equal to A) `1/2sqrt(4+2sqrt(2))`, B) `1/2sqrt(4-2sqrt(2))`, C) `1/4(sqrt(4+2sqrt(2)))`, D) `1/4(sqrt(4-2sqrt(2)))`

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