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Cos2 π x. Cos(2π-x) +sin(π/2+x) =√2. Cos(π2−x). Sin(π+x)+cos(π/2+x)=1. Cos π/2.
Cos(2π-x) +sin(π/2+x) =√2. Cos(π2−x). Sin(π+x)+cos(π/2+x)=1. Cos π/2.

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