Photos 2T 4 5T

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2t 4 5t. Sin п/4. Cos(п/2+t)-cos(п/4-t)=. Sint 4/5 пи/2<t<пи. Cos(t-4п).
Sin п/4. Cos(п/2+t)-cos(п/4-t)=. Sint 4/5 пи/2<t<пи. Cos(t-4п).

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