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Cos пи x. Cos(x+Pi/6). Cos(x-Pi/6)=1. Cos(Pi/2-x) четверть. Cos(x+Pi/6)-3.
Cos(x+Pi/6). Cos(x-Pi/6)=1. Cos(Pi/2-x) четверть. Cos(x+Pi/6)-3.

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