Photos 2SIN X PI 2 COS

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2sin x pi 2 cos. Sin пи x cos пи/2 x -1. Cos 2 Pi 4 x cos 2 Pi 4 x. Cos(Pi/4-х)^2=cos(x+Pi/4)^2. Cos пи(x-2)/3=1/2.
Sin пи x cos пи/2 x -1. Cos 2 Pi 4 x cos 2 Pi 4 x. Cos(Pi/4-х)^2=cos(x+Pi/4)^2. Cos пи(x-2)/3=1/2.

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